Spectators booed as the 37-year-old Djokovic walked off toward the locker room, and he stopped, turned around and responded ...

Novak Djokovic retired injured after losing the opening set of his clash with Alexander Zverev on Friday, sending the German ...

Djokovic is out of the Australian Open after retiring from his semi-final, with Zverev through to face Sinner on Sunday ...

Alexander Zverev urges fans not to boo Novak Djokovic, who retired in the Australian Open Semifinals due to injury ...

Zverev will face defending Australian Open champion and No. 1 seed Jannik Sinner, who beat American Ben Shelton 7-6 (2), 6-2, ...

Noman Ali became Pakistan's first spinner to take a test hat-trick as the West Indies were bowled out for 163 in the first ...

Facing Sinner reminded Alexander Zverev of trying to solve the challenge presented by the 24-time major champion Djokovic.

Graham Denholm/Getty Images Novak Djokovic earned the wrath of the Australian Open crowd after retiring during his semifinal ...

Novak Djokovic motivated Alexander Zverev after the German star finished as the runners-up following his straight set defeat ...