Novak Djokovic is 37 and was forced to stop playing because of an injury at two of the past four Grand Slam tournaments.
On Friday, Djokovic battled World No. 2 Alexander Zverev for 81 minutes in their semifinal match. However, Djokovic immediately retired after losing a 5-6 tiebreak in the first set.
Novak Djokovic faces Alexander Zverev in the semi-finals of the Australian Open on Friday with the Serb's bid for a record ...
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