Overview

• Gauff split with coach Matt Daly days before the tournament and added Gavin MacMillan, known for revamping Aryna Sabalenka’s serve.
• She cited a need for a technical overhaul and said she did not want to “waste time” continuing with a flawed motion.
• Reports note roughly 320 double faults this season, the most on the WTA Tour, underscoring the urgency of the change.
• Gauff will retain longtime mentor J.C. Faurel and opens the US Open against Ajla Tomljanovic early next week.
• Reactions were mixed: Sabalenka praised MacMillan’s impact on her own serve, Andy Roddick projected Iga Swiatek over Gauff in his draw, and Mats Wilander urged caution in Gauff’s early rounds.