Top seeded Novak Djokovic defeats No. 6 Alexander Zverev in four sets, 6-7, 6-2, 6-4, 7-6 to advance to the semifinals of the 2021 Australian Open. 0:00 Highlights of Djokovic’s first set. 1:39 A frustrated Djokovic smashes his racket during the third set, but recovers to win the match. 3:00 Djokovic answers questions after the match about his outburst. #Tennis #AustralianOpen ✔️Subscribe to ESPN+ http://espnplus.com/youtube ✔️ Get the ESPN App: http://www.espn.com/espn/apps/espn ✔️Subscribe to ESPN on YouTube: http://es.pn/SUBSCRIBEtoYOUTUBE ✔️ Subscribe to NBA on ESPN on YouTube: http://bit.ly/SUBSCRIBEtoNBAonESPN ✔️ Watch ESPN on YouTube TV: http://es.pn/YouTubeTV ESPN on Social Media: ► Follow on Twitter: http://www.twitter.com/espn ► Like on Facebook: http://www.facebook.com/espn ► Follow on Instagram: http://www.instagram.com/espn Visit ESPN on YouTube to get up-to-the-minute sports news coverage, scores, highlights and commentary for NFL, NHL, MLB, NBA, College Football, NCAA Basketball, soccer and more. More on ESPN.com: https://www.espn.com