Coco Gauff opened her 2026 US Open campaign with a solid straight-set win over Turkey's Zeynep Sonmez that showcased her improved serve.
The fourth-seeded Gauff, who won the New York Grand Slam in 2023, was broken only once to top the 53rd-ranked Sonmez 6-3, 6-4 in a hard-hitting battle fought mostly from the baseline.
"It's incredible to be back on this court," an exuberant Gauff told the on-court interviewer. "I love playing in this atmosphere."
Gauff, whose service woes last year prompted a dramatic coaching change days before the tournament and contributed to a fourth round exit, came into Flushing Meadows this time feeling much better about the stroke, having won the WTA 1000 event in Cincinnati this month.
A convincing start from Coco! pic.twitter.com/YhhRpCAf3T
— US Open Tennis (@usopen) September 2, 2026
Gauff said she had worked make the toss more consistent under the tutelage of biomechanics expert Gavin Macmillan, who previously helped Aryna Sabalenka retool her serve, improvements that helped the Belarussian rise to No 1.
"It's been a gradual change with the serve," Gauff said. "Slowly it's adapting to maybe the way it should look."
The American star blazed through the opening set without facing a break point, with Sonmez often unable to return Gauff's serve or offering only a weak reply that could be batted off easily.
Gauff broke early in the second set, but the Turkish player raised the level of her game with heavy ground strokes and sneaky forays to the net to finish points with deft volleys.
Sonmez broke back for 2-2 and briefly took the lead.
But at 2-3, Gauff fought off multiple break points in a lengthy game that the American eventually nabbed with another big serve.
Gauff called the hold for 3-3 as "real important".
Coco Gauff shares the Gauff family athleticism power rankings 😅 pic.twitter.com/qlQxnEcKem
— US Open Tennis (@usopen) September 2, 2026
"I like to challenge my opponent to let them keep up the level the whole match, and if they do, you know I clap my hands and I walk off court with my head held high," Gauff said. "But I was able to settle down."
Gauff has drawn confidence "just knowing that it does take a lot maybe to break me," she told reporters, saying of the key service game in the second set, "I knew if I could hold that game, I felt confident breaking the next game."