American tennis star Coco Gauff makes major change just days before US Open

American tennis star Coco Gauff makes major change just days before US Open

Gauff fired coach Matt Daly, while bringing in biomechanics expert Gavin MacMillan

Coco Gauff returns a shot in the Cincinnati Open quarterfinal match against Jasmine Paolini at the Lindner Family Tennis Center in Mason, Ohio, on Friday, Aug. 15, 2025. (IMAGN)

Coco Gauff reacts in the Cincinnati Open match against Jasmine Paolini in Mason, Ohio, on Friday, Aug. 15, 2025. (IMAGN)

Coco Gauff during a practice session before the U.S. Open at USTA Billie Jean King National Tennis Center on Aug. 20, 2025, in New York City. (Al Bello/Getty Images)