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.

Prior to the start of the U.S. Open, Coco Gauff announces the firing of both her coaches amid a recent string of loses.

American tennis star Coco Gauff has parted ways with one of her coaches, Matt Daly, and brought on biomechanics expert Gavin MacMillan, according to multiple reports. Gauff, 21, who has struggled with her serve since her first-round defeat at Wimbledon last month,