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 title.

Novak Djokovic is 37 and was forced to stop playing because of an injury at two of the past four Grand Slam tournaments.

Djokovic is only interested in tennis' biggest prizes. He still has the game to win them, but at age 37 his body is letting him down

Novak Djokovic is out of the Australian Open in stunning fashion. The 24-time slam champion medically retired immediately after dropping the first set of his semifinal match against No. 2 Alexander Zverev in a tiebreak 7-6 (5).

But, regardless of how you feel about him or what you think about him bowing out, nobody — not even Novak Djokovic — deserves to be booed for being injured. You don't have to like him. You can absolutely root against him. You can boo him when he's healthy.

Liverpool striker Cody Gakpo scored twice and created another goal as the hosts cruised to a 4-1 win over lowly Ipswich Town at Anfield on Saturday to remain top of the Premier League.

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,

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

Andy Murray came out of retirement to coach Novak Djokovic at the Australian Open and the move was quickly justified, with the Scot impressing his peers

Two-time Wimbledon champion Andy Murray came out of retirement to coach Novak Djokovic at the Australian Open, and it's safe to say he made quite the impression

Jannik Sinner and Alexander Zverev will face off in the Australian Open Men's Championship match at Melbourne Park live on Sunday, January 26th. WATCH: Sinner v