Coco Gauff bets on Gavin MacMillan to fix her serve days before US Open
Days before the 2025 US Open, Coco Gauff split with coach Matt Daly and hired biomechanics expert Gavin MacMillan, known for rebuilding Aryna Sabalenka’s serve. The move follows a summer of double faults—320 in 48 matches. Gauff says she’s prioritizing long-term development over timing. Changes are already underway as she opens against Ajla Tomljanovic on Arthur Ashe Stadium.
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