US Open: Gauff ends Wozniacki run, Tiafoe and Shelton into quarters – as it happened

Ben Shelton beats Tommy Paul and Coco Gauff sees off Caroline Wozniacki, while Karolina Muchova and Sorana Cirstea also win

Muchova makes 40-0 but two tame points and Wang has a sniff at 40-30, al the more so facing a second serve ... which completes a deuce-inducing double. From there, though, an overhead from a way back, superbly despatched, is followed by a backhand winner cross-court right onto the line and that's 4-2.

Wang can't be getting involved in net exchanges with a player with hands like Muchova, but she does and finds herself 15-30 down; a forehand winner clobbered down the line follows. And Wang can't withstand the pressure, netting tamely on break point to trail 3-2. I daresay Muchova takes greater care with her consolidation attempt this time.