American Coco Gauff begins her U.S. Open title defence on Arthur Ashe Stadium on Monday, headlining a wide open women’s field that includes world number one Iga Swiatek and last year’s runner-up Aryna Sabalenka. Gauff plays France’s Varvara Gracheva in the opening round and hopes to put a series of frustrating performances behind her – including early exits from Toronto and Cincinnati – to recapture the magic of her run to a maiden major title.