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Both players refused to budge on serve - each saving one break point - before heading to a tie-break.

The dominant Draper dropped just 10 points on his serve without facing a break point and will overtake Grand Slam record-holder Novak Djokovic to move into the world's top five on Monday.

World number one Sabalenka disagreed with an "out" call on her shot when she was break point down against Mertens.

Had it not been overruled, Kartal would have had a break point.

Mensik did not face a break point in the second set and the heat and humidity began to take a toll on Djokovic.