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Australian Open Day 13: Djokovic retires injured; Sinner to take on Zverev in men's final

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Djokovic: I didn't hit a ball since Alcaraz match (2:54)

Novak Djokovic reveals he "hadn't hit a ball" since his quarterfinal win after being forced to retire with injury during his Australian Open semifinal with Alexander Zverev. (2:54)

It was an eventful day of tennis after 10-time Australian Open champion Novak Djokovic was forced to retire from his semifinal bout with Alexander Zverev due to injury, while world No. 1 Jannik Sinner was far too strong in his clash with big-hitting American Ben Shelton.

Here's what went down on Day 13 of the tournament: