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.

Novak Djokovic wrote a heartfelt message to Alexander Zverev on Instagram after his injury retirement in the Australian Open.

Novak Djokovic dramatically retired from his Australian Open semi-final to a chorus of boos from sections of the Rod Laver Arena crowd as opponent Alexander Zverev called for “respect” to be shown to ...

Novak Djokovic has retired from his Australian Open semifinal against Alexander Zverev after losing the first set in a ...

Alexander Zverev chided the crowd after they booed Novak Djokovic for retiring due to injury after the first set in an Australian Open semifinal.

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

Novak Djokovic vs Alexander Zverev, Australian Open Highlights: The first set went on for more than an hour and Djokovic was looking quite good but he shockingly retired as soon as he lost the first ...

Zverev will face defending Australian Open champion and No. 1 seed Jannik Sinner, who beat American Ben Shelton 7-6 (2), 6-2, 6-2, in Sunday's final. Zverev is pursuing his first major tournament ...

Alexander Zverev had a classy response to Novak Djokovic's medical retirement on Friday. Zverev won the first set of his ...

Novak Djokovic vs Alexander Zverev Highlights, Australian Open Semifinal: Alexander Zverev advanced to final of men's singles at Australian Open as his semi-final opponent Novak Djokovic pulled ...

On Sunday, Alexander Zverev will chase his first Major title against Jannik Sinner in the Australian Open final. The German ...

It seems as if there’s always something going on with Novak Djokovic at Grand Slam tournaments. Even he says so.