Australian Open defending champion Jannik Sinner described the semi final retirement of Novak Djokovic as "very unfortunate" after locking in his spot in the final.Sinner was ruthless in his semi final against Ben Shelton, defying fitness concerns to claim a straight sets victory.As Djokovic retired against Alexander Zverev due to injury, Sinner was warming up in preparation to play Shelton.AdvertisementRECAP: Australian Open 2025, day 13 results and highlightsREAD MORE: Djokovic jeered by crowd as he leaves arena after quitting semi finalREAD MORE: 'Disrespectful' or a sign of the times? Tennis' big crowd issueDjokovic's tough call brought to a close his tournament and could be the last time he's seen on Rod Laver Arena.Jannik Sinner discusses Novak Djokovic's semi final retirement. Getty/Australian OpenSpeaking after his win, Sinner admitted he didn't see it live but believes Djokovic must have "big issues" with his fitness to make such a decision."It's very unfortunate to see these kind of things, especially in semi finals of grand slams," he said in his press conference."But if Novak retires, it means that he has big issues. He has won here in the past with some physical problems, and he always tried to do his best. He gave so much until now in his career for this sport."It's unfortunate to see. I wish him a speedy recovery."Watch the Australian Open live & free on the 9Network & 9Now. Stan Sport is the only place to watch every match ad-free, live & on demand with centre court in 4K.The medical retirement of Djokovic and Sinner's win means it's the world No.1 vs the world No.2 in the final.Asked for his thoughts on Zverev as an opponent, Sinner declared "it's going to be mental"."It's going to be a tough match for both of us. It's going to be physical, for sure," he said."I think he played some incredible tennis to go to the final. It's tough to say whoever is the favourite in a way because everything can happen."These are all questions we are going to get answered Sunday. It's very difficult to talk today in advance."
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