LAS VEGAS -- From the beginning of 2018 until today -- a span that encompasses 30 months -- the UFC has promoted exactly four heavyweight title fights. In other words, not even two per year.

That kind of inactivity at the top of a weight class produced a logjam -- a bottleneck of contenders impatiently waiting for an opportunity to vie for a UFC title. And perhaps no heavyweight has been more impacted by this than Curtis Blaydes, whom ESPN ranks No. 4 in the division.

Blaydes (13-2) will seek his ninth win in 11 UFC appearances Saturday night, when he takes on Alexander Volkov (31-7) in the main event of UFC Fight Night. Should Blaydes win, which he is heavily favored to do, he still might be waiting for a title shot. Current champion Stipe Miocic is scheduled to face Daniel Cormier on Aug. 15, and another contender in Francis Ngannou will probably be next. Blaydes' best shot, should he win Saturday, might be for Miocic and Cormier both to retire after they complete their trilogy. Cormier said he will, and there's speculation Miocic may also call it quits. If that happens, Blaydes may get a shot for the vacant title against Ngannou, who already owns two wins over Blaydes.

That's a tough backdrop for a fight, but it doesn't appear to have done anything to Blaydes' confidence. He shared on social media this week he intends to "rag doll" Volkov inside the UFC's Apex facility. Blaydes can't control the logjam in his division, but at least he feels he can control Saturday's fight.

The co-main event may turn out to steal the show as Josh Emmett and Shane Burgos are expected to provide nonstop action.

Brett Okamoto, Marc Raimondi and Jeff Wagenheim recap all the action, as it happens.

Fight in progress:

Men's featherweight: Josh Emmett (15-2, 6-2 UFC, +120) vs. Shane Burgos (13-1, 6-1 UFC, -140)

Results:

Women's bantamweight: Raquel Pennington (11-9, 8-5 UFC) defeats Marion Reneau (9-6-1, 5-5-1 UFC) by unanimous decision

Pennington got stronger as the fight wore on, and her work against the cage -- knees to the midsection from a Thai clinch, mostly -- sapped the strength of Reneau and secured the victory.

Reneau, fighting on her 43rd birthday as the oldest competitor on the card, had her moments, scoring a couple of takedowns and landing some shots from distance. But as the fight wore on, and it became a close-range battle, Pennington showed off her strength. She outlanded Reneau in the clinch by a 42-12 margin, and she built a 44-17 edge in body strikes.

That's my girl ⛰??? #Rocknado Let's go!! @ufc @espnmma @RockyPMMA Let them hands fly

— Tecia Torres (@TeciaTorres) June 21, 2020

These blows slowed the reaction time of Reneau, allowing Pennington to score with punches to the head as well.

Two judges scored the fight 29-28 and one had it 30-27, completing a clean sweep for the Colorado couple of Pennington and Tecia Torres. Earlier, Torres won her strawweight bout with Brianna Van Buren, also by unanimous decision. It was the first time Pennington and Torres had competed on the same UFC card since 2016.

Pennington is just 6-5 in the UFC, but all of the losses came against reigning or former UFC champions. Despite entering the Octagon having dropped three of her previous four, she is No. 8 in the ESPN women's bantamweight rankings.

Reneau has dropped her last three fights.

-- Wagenheim

Welterweight: Belal Muhammad (17-3, 7-3 UFC) defeats Lyman Good (21-6, 3-3 UFC) by unanimous decision

Sometimes the most effective weapon for a fighter is the ability to adjust.

Good landed a huge combination in the third. Muhammad was hurt, on wobbly legs. The end seemed to be near.

"We were going according to plan until he rocked me," Muhammad said. "Sometimes we have to go to Plan B."

That turned out to be leaning on his wrestling. Muhammad was able to weather Good's storm, take him down, get his back and ride out the rest of the final round. Muhammad held on for a unanimous-decision (29-28, 29-28, 29-28) win in a hard-fought battle.

You gotta respect Belal Muhammad. You know what you're getting from him every time. Gritty performance and never lets off the gas. Great fight from him. #UFCVegas3

— Scott Holtzman (@HotSauceHoltzy) June 21, 2020

Muhammad's footwork and diversity was the key in the first two rounds. Good walked him down, but Muhammad never let him cut off the cage and mixed in combinations to keep the power puncher at bay. Good seemed frustrated that Muhammad wouldn't stay in place long enough for him to land a big shot. Meanwhile, Muhammad was able to land combinations and kicks in winning those two rounds.

Good finally caught up to Muhammad in the third round. He got him against the cage and landed a hard combination that put Muhammad in trouble. But Muhammad was able to stay on his feet, then eventually get Good down with wrestling.

Afterward, Muhammad called out ranked welterweights Santiago Ponzinibbio and Rafael dos Anjos. Muhammad joked that Ponzinibbio is still ranked despite not having fought in "25 years." Ponzinibbio hasn't fought since December 2018 due to injury and illness.

Muhammad, 31, has won three straight and seven of his last eight. The only opponent he has lost to in that time was Geoff Neal, who he trained with during this camp at Fortis MMA in Dallas. Muhammad, a Chicago native, is tied for third with most wins (8) in the UFC welterweight division since 2016, per ESPN Stats & Info. Only Vicente Luque (10) and champion Kamaru Usman (9) have more.

Good, 35, came into this fight dealing with the death of his father, Lyman Good II. Good was initially supposed to fight Muhammad in April, but Good tested positive for COVID-19. He fully recovered by late April, but was the first UFC fighter to announce that he was positive for COVID-19.

-- Raimondi

Watch this fight on ESPN+.

Catchweight (160 pounds): Jim Miller (32-14 1 NC, 21-13 1 NC) defeats Roosevelt Roberts (10-2, 4-2 UFC) by first-round submission

For real, who doesn't love them some Jim Miller?

The 12-year UFC veteran earned his 21st win inside the Octagon by submitting Roberts via armbar, just 2:25 into their 160-pound catchweight bout. The win moved Miller into third on the UFC's all-time win list, trailing only Demian Maia (22) and Donald Cerrone (23).

MOST WINS - UFC History
23 - Donald Cerrone
22 - Demian Maia
21 - @JimMiller_155

MOST SUBMISSIONS - UFC History
14 - Charles Oliveira
11 - Demian Maia
10 - Royce Gracie
10 - @JimMiller_155
09 - Nate Diaz#UFCVegas3 pic.twitter.com/9IRu7w3Ost

— UFC News (@UFCNews) June 21, 2020

Miller, 36, put Roberts in a tough position in the opening seconds, as he swept the young prospect off his feet with a leg kick. Miller, who now has 18 submission wins on his résumé, moved into top position and then transitioned to an armbar when Roberts attempted to scramble from the bottom. It is the first time Roberts has been finished in his career.

Saturday also marked Miller's 35th fight in the UFC, which moves him into a tie for the all-time record with Cerrone. Additionally, Miller holds the record for most first-round submission wins in the UFC's modern era, with nine. All four of his most recent wins have actually come via first-round submission.

"It means the most to me, it really does," Miller said. "I feel the weight on my shoulders to do the right things and live my life like that and keep that respect because I've earned it by the way I carry myself. When guys who have worn the belt around their waist and have been perennial contenders and coaches who have coaches against me come up to me and show me that respect, it's amazing. I wouldn't trade it for anything.

"I feel like I have a responsibility to the Roosevelts, the guys coming up. I'm not perfect, I don't do everything perfect and that's obvious, but I do this with the utmost respect for the athletes that share the Octagon with me. I feel like we need it, especially with the way things are going right now in 2020. Just showing some respect for people that are grinding right alongside you and their grind might be a little bit different, their path might be a little bit different, but everyone is dealing with things.

"I did deal with lyme disease for a few years and I fought some guys who went on to fight for title and were former champions when I was dealing with it and I wouldn't take it back. I wouldn't take any of it back because I've seen the other struggles that other fighters have had to deal with, just because mine is different doesn't mean that mine is any tougher. I love this sport, I miss the fans, it sucks not having that. Anybody that's willing to bust their ass and get inside the Octagon and earn that spot, nobody is given it, you have to earn it and come out here and compete. It's not easy, it's not an easy lifestyle and I have a ton of respect for anyone that does it."

-- Okamoto

Watch this fight on ESPN+.

Lightweight: Bobby Green (25-10-1, 6-5-1 UFC) defeats Clay Guida (35-16, 15-13 UFC) by unanimous decision

Green walked out of the Octagon with a decision in his pocket, but his fighting style even in victory made one understand why he had walked into the cage with just one win in his previous seven fights.

While Guida was perpetual forward motion for three rounds, Green stood motionless, hands at his side, for extended stretches, relying on his fast hands and strong defensive wrestling to pick off Guida's entries. Green earned the nod of the judges -- two scored it 29-28 and the third had it 30-27 -- by outlanding Guida by a huge margin. He landed 85 significant strikes to Guida's 23. But Green had outlanded both of his past two opponents, yet lost both fights.

Congrats to both clay and Bobby. Great fight.

— michael (@bisping) June 20, 2020

Green, whose disappointment with judges' decisions played a factor in him retiring from the sport in 2018, had to fight from his back after the relentless Guida landed three takedowns. But Green fended off nine other attempts, and even when he was caught on the canvas, he absorbed zero strikes from Guida.

While Green seemed lackadaisical from distance, he did some of his best work from the clinch, landing 16 strikes from that position. Guida landed zero.

For Guida, it was his 14th UFC loss, second most in history behind Jeremy Stephens' 17. Guida, 38, was fighting in his 29th UFC bout, seventh most ever.

"To fight a legend, I beat a Hall of Famer," Green said. "That's awesome.

"To be honest, I always try to keep my numbers higher than the other fighter [but] he was able to get those takedowns going, so I wasn't sure how they were going to judge things. They look like they could tell he's not doing anything with them, he's moreso holding me and it's not even a good position. He's not scoring off of it, so thank God they were able to see those things."

-- Wagenheim

Strawweight: Tecia Torres (11-5, 7-5 UFC) defeats Brianna Van Buren (9-3, 1-1 UFC)

On at least two previous occasions, it seemed Torres would fight for the UFC women's strawweight title -- if not become the division's champion. That's how highly people thought of her at the launch of the women's 115-pound weight class in 2014.

On Saturday, Torres showed the version of herself that had people thinking gold. Torres flashed brilliance in a unanimous decision (30-27, 30-27, 30-27) win over Van Buren to snap a four-fight losing streak.

???????????? yes!!! @TeciaTorres ?

— Amanda Nunes (@Amanda_Leoa) June 20, 2020

Van Buren controlled the early going of the first round, pushing Torres against the cage and looking for takedowns. It was clear that Van Buren, who trains with the likes of Daniel Cormier at American Kickboxing Academy, wanted to take things to the ground. Torres never let that happen with any consistency.

By the end of the first, Torres had her groove, stuffing Van Buren's takedown attempts and letting her limbs -- all of them -- fly in the striking department. She hurt Van Buren with combinations while breaking out of a clinch toward the end of the first and really never looked back after that.

Torres' hands and kicks were simply too quick. In the second, she landed a big flurry and solid left hands with Van Buren coming in. Torres let her kicks go in the third, finding a home for the left body kick and front kicks to the body. Van Buren had no answer for the quickness while in the middle of the cage.

Torres, 30, had not won since beating Michelle Waterson at UFC 218 on Dec. 2, 2017. During that four-fight losing skid, Torres fought current champion Zhang Weili and former champions Joanna Jedrzejczyk and Jessica Andrade. The Massachusetts native, who lives and trains in Colorado, now has seven UFC wins at strawweight, tied for second in division history with four others.

Van Buren, 26, came in on a six-fight winning streak. The California native won the Invicta FC women's strawweight title in May 2019 by winning a tournament after fighting three times in a single night.

"I'm coming off some tough losses, they weren't bad losses, they're against champions," Torres said. "If you are in there against champions and you do what I did and you didn't get the s--- beat out of you I think you still need to be talked about. I wanted that win, I need that win kind of and I got it.

"I really thought she would try to take me down and grab me the entire time, and that's what she did, I don't think she wanted to strike with me. No question about being done, I'm still relatively young, I've been in the sport for a long time, but I'm 30 and my body is able. I want to go for that title shot, I want to be champion. I truly believe that I can be champion. It's just me having me perform."

-- Raimondi

Watch this fight on ESPN+.

Middleweight: Marc-Andre Barriault (12-4, 1-3 UFC) defeats Oskar Piechota (11-4-1, 2-4 UFC) by third-round TKO

It took him much longer than he would have liked, but Quebec's Barriault finally has his first win in the UFC.

The Canadian middleweight finished Piechota via TKO at 4:50 of the second round, after hurting him with an uppercut and right cross along the fence. Piechota eventually went down to one knee, and then fell over onto his back, prompting referee Chris Tognoni to step in. It's Barriault's first victory in four trips to the UFC's Octagon.

Barriault with an amazing performance. ???????? #UFCVegas

— Tatiana Suarez (@tatianaufc) June 20, 2020

It was obvious Barriault wanted to pressure Piechota from the opening bell, and he did so effectively. He found a consistent home with the right hand, and mixed in elbows when the action was in close. Piechota really didn't have much of an answer. He landed a couple of uppercuts of his own, as well as an occasional jab to try to slow Barriault's pressure, but spent the most of the bout with his back near the fence.

Barriault, 30, records his first win since September 2018. Piechota's misery in the UFC continues, as he has been finished in four consecutive bouts.

"Like I said before, during all this crazy time, I just work on myself, I reconnect with my old route, so here I am with my old team, the best version of me, so tonight you saw everything," Barriault said. "I worked a lot on my mindset, just to reconnect my body and my mind. Just to be me during the moment, just float with everything, not thinking too much, just all action.

"I felt he was strong during the first round, so he hit me with a couple of good shots, but I stayed composed and I just worked the game plan. The game plan was just to let everything loose, be confident, just work the timing and let the hands go, so that's what I did.

"If the UFC gives me this type of guy, of opponent, I will put on a very good show. My past three fights, those guys were kind of, they taste my power right away so they just wrestle me. Right now, I want to fight, I want more, let's go."

-- Okamoto

Watch this fight on ESPN+.

Women's flyweight: Gillian Robertson (8-4, 5-2 UFC) defeats Cortney Casey (9-8, 5-7 UFC) by third-round rear-naked choke

It looked as though the fight would go into the books as three lookalike rounds with Robertson dominating Casey with ground control but little threat of finishing her. Then, as the final seconds ticked down, Robertson suddenly seized a rear-naked choke and got the tapout at 4:32 of Round 3.

Thus, Robertson continued her run of finishing every one of her seven UFC bouts. It was her fourth submission, the most in UFC women's history. According to ESPN Stats & Information, it also was the latest stoppage in UFC women's history, coming with 24 seconds left on the clock.

Sweet choke

— Jamahal Hill UFC (@JamahalH) June 20, 2020

Before the choke, all three rounds played out almost identically. In Rounds 1 and 2, Robertson absorbed a couple of crisp right hands before taking Casey to the canvas before the round was a minute old. Robertson took a little more time to get to the mat in Round 3, but just like in the first two rounds, she maintained top control the rest of the way.

Robertson advanced her position again and again, and the best Casey could do for the most part was regain full or half guard. She did attempt an armbar midway through the final round, but Robertson did not appear to be in trouble. Then Robertson seized control again and finished the job.

"I actually saw a chart saying that I was equal with Ronda Rousey last week [in submissions], and I was like, holy s---, that's awesome," Robertson said. "So, now to see that I have the most submissions in women's UFC history, it's mind-blowing right now, it's just the beginning of my career. I'm going to set that record and I'm going to push it even farther so that no one can break it.

"I definitely knew that arm bar would be dangerous and she was going for it the whole fight, I felt her keep on attempting it. When she did actually go for it, she had her fingers on the inside of my glove here, so she was pulling my arm in more by pulling my glove. So that's why I said something to the ref, but obviously it doesn't matter in the end, I'm still there to fight, I'm there to fight to the death, so I'm content with that and I'm just going to go for the throat consistently until then."

-- Wagenheim

Watch this fight on ESPN+.

When Jaynes woke up three days ago, he wasn't even on the UFC roster. With very few MMA events being held right now outside the UFC due to the coronavirus pandemic, he said he was just sitting around "all depressed."

Now, less than 72 hours later, he has a highlight-reel knockout in his UFC debut that lasted less than a minute.

FASTEST DEBUT FINISHES - UFC Lightweight
0:38 - Diego Ferreira (SUB)
0:41 - @JustinJaynesMMA (KO)
0:41 - Charles Oliveira (SUB)
0:42 - Alexander Hernandez (KO)
0:46 - Devonte Smith (KO)#UFCVegas3 pic.twitter.com/qD8XAUQkuJ

— UFC News (@UFCNews) June 20, 2020

Jaynes landed four huge left hooks -- and some hard right hands in between -- to stop Camacho by TKO at 41 seconds of the first round. Jaynes was slotted into this spot when Matt Frevola, Camacho's initial opponent, was pulled from the card due to his cornerman testing positive for COVID-19.

"I'm waiting to wake up from a dream right now," Jaynes said.

Jaynes is now is tied for the second-quickest finish for a debutant in UFC lightweight history with Charles Oliveira. Diego Ferreira has the fastest finish (38 seconds).

Jaynes, 30, has been a pro MMA fighter since 2013 and a regular at Xtreme Couture in Las Vegas for more than a decade. Yet, he had not gotten a shot in the UFC until now. Jaynes, a Michigan native, has won five in a row overall. He was previously competing for the regional promotion WXC in his home state. Jaynes has won nine of his past 10 with seven finishes.

Camacho, 31, has now dropped two straight. The Guam resident has been known for his exciting fights, but has just one win since 2017.

"I can't say that I'm surprised, I knew what the game plan was, come in the pocket and throw some heat," Jaynes said. "If he gets caught early, he gets caught early, if he gets caught late, he gets caught late. I'm glad we're in, we're out, I'm happy about it, can't say that I'm not happy about it.

"I feel like I am the most overlooked fighter around. I'm hoping with that performance that people aren't going to overlook me anymore. Frank, like you said, he's a veteran of the sport, it's his seventh UFC fight, I'm a fan of Frank, it was an honor to be in the cage with him, I'm super excited."

-- Raimondi

Women's flyweight: Lauren Murphy (13-4, 5-4 UFC) defeats Roxanne Modafferi (24-18, 3-6 UFC) by unanimous decision

Murphy extended her win streak to three with a clear-cut unanimous decision over the former title challenger.

According to UFC Stats, Murphy outstruck Modafferi 108 to 102 and wobbled her with a short right hand in the second round. Modafferi continued to press forward throughout the fight, but found herself repeatedly walking into Murphy's counter right hand. She forced her way into the clinch multiple times, but Murphy did well defending those positions and disengaging.

MOST FLYWEIGHT WINS - UFC History
5 - Valentina Shevchenko
5 - Katlyn Chookagian
4 - Lauren Murphy
4 - Joanne Calderwood
4 - Montana de la Rosa
4 - Jessica Eye
4 - Gillian Robertson#UFCVegas3 pic.twitter.com/gO4sHGCAQK

— UFC News (@UFCNews) June 20, 2020

Murphy, who fights out of Texas, has been on a roll over the past year. The 36-year-old was coming off upset wins in her past two fights against Mara Romero Borella and Andrea Lee. Her four total wins in the UFC's flyweight division ranks second all-time, behind current champion Valentina Shevchenko and Katlyn Chookagian.

Modafferi continues her trend of alternating wins and losses, which dates all the way back to 2017.

"I have the longest win streak in the flyweight division right now and all of my wins are over ranked opponents," Murphy said. "Nobody else in the flyweight division can say that. I knocked out the No. 12 contender, I beat Andrea Lee and she was ranked No. 7 and I was a 4-1 underdog in that fight. I believe I was the underdog, in fact I've been the underdog in every fight I've had at flyweight and I think almost every fight that I had at bantamweight. I'm 4-1 in this division and my last three wins are over ranked opponents, my only loss is to someone that is now a bantamweight and she was undefeated at flyweight. I definitely deserve a spot in the top five, I think I deserve a spot on the women's pound-for-pound list and I want to fight Cynthia Calvillo next.

"She's the girl to beat right now. She's a really, really excellent fighter. She walked right into the division and she took the No. 2 spot and I think that's a great matchup for me. I think I can beat her and I want to show everybody that I can."

-- Okamoto

Watch this fight on ESPN+.

Lightweight: Austin Hubbard (12-4, 2-2 UFC) defeats Max Rohskopf (5-1, 0-1 UFC) by second-round TKO

Hubbard withstood an early storm from Rohskopf, but in the end that was all Rohskopf had in him in his UFC debut. Hubbard put a beating on him in a one-sided Round 2, and Rohskopf quit on his stool at the end of the round.

This is a tough sport and there is no shame in being done when you can't go any further. I personally would be in regret for the rest of my life but hey I don't have to fight Austin

— Randa Markos (@randamma) June 20, 2020

Rohskopf came in riding a hype train. Though he had only five pro fights, he had won them all by submission. And early on, he showed off the pedigree from his training with grappler extraordinaire Robert Drysdale at Xtreme Couture in Las Vegas, putting Hubbard in trouble on the mat twice in the opening round and threatening submissions. But Hubbard escaped both times, and he made Rohskopf pay with solid punch and kick combinations. By round's end, Hubbard's confidence was soaring and Rohskopf's was flagging.

Round 2 began with hope for Rohskopf, who took this fight on 10 days' notice. He got the fight to the canvas again within the first five seconds. But Hubbard quickly got back to standing, and it was one-way traffic from then on. Hubbard, who trains at Team Elevation in Denver, put it on Rohskopf -- leg kicks, body punches, jabs, straight right hands. By the time the horn sounded, Rohskopf was bloody and sagging. And then he told his cornermen he was done.

According to UFC Stats, Hubbard led Rohskopf 45-6 in significant strikes in the second round.

"I seen him shaking his head and I heard the ref saying, 'It's over' and I was like, 'What really?' I've never experienced that, I'm not complaining, I got the finish so I'll take it," Hubbard said. "Once I was popping up right away off those takedowns and he couldn't control me at all, especially when he did surprise me a little bit on those rolls, where he got my legs. I defended them and got out pretty quick and got back up and I think it scared him.

"I think he realized he was in over his head a little bit and I think also that he knew he had nothing for me on the feet and I had a lot for him. He's a very talented person, a lot of good attributes, but he's really green in his career still, he's 5-0. There's a lot to learn, I think someone told me he fought one opponent over .500. This is the next level, I fought a lot of people that were really good before I got here into the UFC. I won multiple regional titles before I got here to the UFC and I'm really thankful about that. I got into the UFC at 10-2 which seems kinda long, it was longer at the time than I wanted, but it gave me that experience that I need to be here now and I'm super thankful for that and I'm looking forward to the future."

Rohskopf's manager Brian Butler said Rohskopf "suffered from fatigue due to the short-notice weight cut combined with a pre-existing turf toe injury and was not able to overcome both. He is going to take some time off to heal up."

-- Wagenheim

Watch this fight on ESPN+.

Still to come:

Heavyweight: Curtis Blaydes (13-2 1 NC, 9-2 1 NC, UFC, -400) vs. Alexander Volkov (31-7, 5-1 UFC, +320)