Coco Gauff admitted trying to fix her serve while playing in the US Open is “mentally exhausting” after battling to a three-set win over Alja Tomljanovic in the opening round.
Gauff has struggled with double faults this season and hired biomechanics expert Gavin MacMillan, who previously worked with World No 1 Aryna Sabalenka, in a bid to improve her serve.