Rafael Nadal's record tally of 12 French Open titles will still be talked about "in 200 years", says former British number one Greg Rusedski.
Nadal, 33, is the first player to win a dozen singles titles at the same Grand Slam.
The Spanish second seed beat Austria's Dominic Thiem 6-3 5-7 6-1 6-1 in Sunday's final at Roland-Garros.
"This is the unbreakable record," former US Open finalist Rusedski told BBC Sport.
Nadal's third successive win on the Paris clay moved him clear of Margaret Court's tally of 11 Australian Open titles.
The Spaniard is only the second player to win the same tour singles event a dozen times, with Martina Navratilova having won 12 titles at Chicago between 1978 and 1992.
"Most players don't win 12 titles in their careers, he has won 12 clay-court majors at Roland-Garros," Rusedski said.
"When we're dead, in 200 years from now, people will be talking about Rafael Nadal winning 12 French Opens.
"It is incomprehensible.
"This is the Tour de France of tennis and to do it 12 times is superhuman."
'Big three's longevity is unheard of'
By beating 25-year-old Thiem for the second successive year in the final, Nadal increased his tally to 18 major triumphs.
Only long-time rival Roger Federer has won more Grand Slams, sitting two ahead of the Mallorcan in the all-time list of men's singles triumphs.
Serb world number one Novak Djokovic, who was denied the chance to hold all four Slams at the same time by Thiem in the semi-finals, is now three behind Nadal.
Nadal, 37-year-old Federer and 32-year-old Djokovic have won the past 10 Grand Slam titles between them.
Britain's Andy Murray was the last player under 30 to win a Grand Slam men's singles title when he won Wimbledon aged 29 in 2016.
"The last 'next generation' had a lot of war wounds against the likes of Federer, Nadal, Djokovic and Murray, they didn't necessarily believe they could possibly beat these guys," Rusedski, 45, said.
"But I think the new guys - led by Stefanos Tsitsipas, Felix Auger-Aliassime, Denis Shapovalov - this generation may not have the same war wounds.
"And in a couple of years obviously Roger will be nearly 40 and Rafa and Novak will be in their mid-30s - if they are all still playing then.
"To do what they are doing is unheard of.
"It is still those big three and the other guys are trying to knock on the door.
"We want to see one of those younger guys take a Slam."
'Women's game full of intrigue - and that will return to men's game too'
With Nadal beating Federer and Thiem seeing off Djokovic, the men's semi-finals at a major were contested by the top four seeds for the first time since the 2012 Australian Open.
By contrast, the women's draw was wide open after early exits for top seeds like Angelique Kerber, Naomi Osaka and Serena Williams.
Only one of the last four - Britain's Johanna Konta - had previously reached a Grand Slam semi-final, while two of the others - American Amanda Anisimova and runner-up Czech Marketa Vondrousova - were teenagers.
Eventual champion Ashleigh Barty claimed her first Slam singles title with a 6-1 6-3 victory over 19-year-old Vondrousova.
"On the women's side there are about 10 to 15 women who could win," Rusedski said.
"There is a lot of intrigue because you don't know who is going to win - that's great to have going into a Slam.
"We will see that level of intrigue come back in the men's, of course we will. I can't see the same domination.
"We had [Andre] Agassi and [Pete] Sampras and when they retired it was 'what's going to happen now?'. There was a two-year gap and then all of a sudden Federer, Nadal and Djokovic all showed up.
"Tsitsipas is going to be a big superstar in our game, you've got [Alexander] Zverev, you've got Thiem.
"There will be a little transition period, it might take a year or two, but there will be stars to replace the big three."
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