US Open: Pegula stuns Swiatek to bolster American semi-final lineup
Host country now has four players in the semi-finals while men's top seed will face Jack Draper
Djokovic grinds into US Open third round after 'awful' serving display
Defending champion advances after Laslo Djere retires injured while Coco Gauff also progresses in the women's draw
Coco Gauff to face stiff challenge in US Open title defence
No1 Iga Swiatek and last year's runner-up Aryna Sabalenka part of a strong field in New York
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