Coco Gauff began her bid for a second US Open title with a straight-sets win over Zeynep Sonmez. The American fourth seed, champion in 2023, was tested in the second set but came through 6-3 6-4.
Gauff admitted to feeling nervous before the match. "I was nervous in the tunnel, and then for some reason when the warm-up started, it went away," she said. "I think it showed the first game how I came out serving really well."
Second seed Elena Rybakina also advanced, beating teenage American wild card Thea Frodin 6-3 6-2. Frodin, who once played Serena Williams' double in the film King Richard, said she had not met Williams but hoped to do so soon.
In the men's draw, fifth seed Flavio Cobolli needed five sets to beat Francisco Comesana, while ninth seed Taylor Fritz defeated fellow American Darwin Blanch in three. Gael Monfils, who retires at the end of the year, celebrated his 40th birthday with a 2-6 6-2 6-1 6-0 victory over Adolfo Alvarez.