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

MELBOURNE, Australia (AP) — Play has started in the Australian Open final between defending champion Jannik Sinner and Alexander Zverev. It's the first men’s final between the players ranked No. 1 and No. 2 at Melbourne park since Novak Djokovic defeated Rafael Nadal in 2019.

Novak Djokovic has retired from his Australian Open semifinal against Alexander Zverev after losing the first set in a tiebreak. Djokovic missed a regulation putaway volley on top of the net down 5-6,