American Emma Navarro, the No 13 seed, advanced to the last 16 of the US Open by defeating Ukrainian Marta Kostyuk, the No 19 seed, 6-4, 4-6, 6-3.
Navarro, ranked No 12, will play American Coco Gauff, the No 3 seed, next.
Ahead of her victory, the American won against Russian Anna Blinkova (6-1, 6-1) and Dutchwoman Arantxa Rus (6-1, 6-1).
Kostyuk, ranked No 19, beat American wildcard McCartney Kessler (6-2, 6-3) and Harriet Dart (7-6 (10), 6-1) in the previous rounds.
New York (Grand Slam), other third-round results (USTA Billie Jean King National Tennis Center, hard, USD 75.000.000, most recent results first):
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