Novak Djokovic of Serbia reacts as he receives treatment to a foot injury during his quarterfinal match against Lorenzo Musetti of Italy at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2026. (AP Photo/Dita Alangkara)tennisBy JOHN PYEAfter a walkover and an in-match retirement, 10-time Australian Open winner Novak Djokovic will meet two-time defending champion Jannik Sinner in the semifinals. Sinner has a 6-4 lead in head-to-heads with Djokovic, but he's won the last five. That sequence includes semifinals at the 2024 Australian Open and at Roland Garros and Wimbledon last year. “I continued to play because I was playing really, really, really well, but I was feeling that the pain was increasing and the problem was not going away.”Djokovic said he felt for Musetti.