Recent U.S. Open champions Aryna Sabalenka, Iga Swiatek and Coco Gauff lead the women's field when singles play begins Sunday at Flushing Meadows.

Coco Gauff fires her coach ahead of the US Open, raising concerns about her form and potential. Despite past successes, her struggle with serves continues.

Matthew Daly is out and Gavin MacMillan is in to correct Coco's spate of double faults that has put her in a deep tailspin since winning the French Open.

Coco Gauff has made a coaching change ahead of the U.S. Open, with the 21-year-old parting ways with Matt Daly and turning to Gavin MacMillan to help her rediscover her best form ...