Isner faces 3rd seed Stefanos Tsitsipas in the quarterfinals, who stunned defending China Open singles champion Nikoloz Basilashvili in a three-set marathon, 4-6, 6-3, 6-2.

The first set saw Basilashvili nab an early break to go 2-1 up, a lead that he would maintain for the rest of the opener as the two served out the remainder.

The second set was something of an inversion of the first. Basilashvili started coughing up unforced errors on both sides, allowing Tsitsipas to drag him to break point three times before converting to go 3-1 up.

Five double faults from the Georgian would help Tsitsipas run away with the second set and force a decider, where he would go on to break Basilashvili twice more while never facing a break point himself to seal the win in two hours and ten minutes.

The last men's match of the day saw No. 2 seed Alexander Zverev issue a real statement of intent, dispatching Felix Auger-Aliassime of Canada 6-3, 6-1 in impressively quick fashion.

The German comprehensively outplayed his younger rival, holding all his service games and dominating the match both from the baseline and at the net, and the gulf in class between the two was all too evident as Zverev closed out the match in just over one hour.

The German's reward for his victory is a quarterfinal tie against Sam Querrey, after the American served up 32 aces on his way to defeating Argentina's Diego Schwartzman 7-6 (2), 6-7 (6), 6-3

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