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Alexander Zverev kept his cool to battle past USA's Learner Tien on a sweltering day at the Australian Open ...

Sabalenka, who is a Whoop ambassador, is not allowed to wear the devices on court during the Australian Open ...

The quarter-finals take place in Melbourne while top players battle a heatwave in Melbourne ...

Zverev moved through to the semi-finals with a 6-3 6-7 (5) 6-1 7-6 (3) victory.

Sabalenka claimed a 6-3 6-0 victory as temperatures soared in Melbourne.

The top six seeds in both the men's and women's tournaments are still standing to set up blockbuster quarter-finals, and there are two different reasons to explain this piece of history ...

The organisers of the Australian Open have been forced to adjust their schedule with a heatwave expected to hit at the start of the quarter-finals ...

Sinner, Alcaraz and Aryna Sabalenka have been caught wearing fitness trackers during their matches at the Australian Open ...

The two-time defending champion maintained his perfect record against fellow Italians with victory over Luciano Darderi.

Sinner was spotted wearing a Whoop device, after Carlos Alcaraz was also busted by tournament officials ...