Fourth seed Karolina Pliskova breezed into the second round of the US Open with a 6-3 6-4 win over American Caty McNally.
The Wimbledon runner-up, who also made the US Open final in 2016, hit 25 winners, including eight aces, to advance in 83 minutes.
The 29-year-old won five of 11 break points while her opponent only took three of her eight chances. She will next face 20-year-old Amanda Anisimova, who won 7-5 6-2 against Zarina Diyas.
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Maria Sakkari also progressed with a 6-4 6-3 win over Marta Kostyuk.
No 17 seed Sakkari made the fourth round of the US Open last year, pushing Serena Williams close in a tight three-set match.
She was comfortable against Kostyuk as she hit 25 winners and converted five of six break points.
Olympic champion Belinda Bencic won 6-4 6-4 against Arantxa Rus and Martina Trevisan beat American Coco Vandeweghe 6-1 7-5.
Ajla Tomljanovic won in straight sets against Katie Volynets while Zhang Shuai beat Hailey Baptiste 6-3 6-4 and Petra Martic was a 6-3 6-2 winner against Dalma Galfi.
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