Learner Tien survived 0-40 in the deciding set and beat Jakub Mensik in five, becoming the youngest American man in the US Open fourth round since Andy Roddick in 2002.
Zheng Qinwen, a qualifier ranked 121, recovered from 0-5 down in the third set and saved a match point to beat Madison Keys and reach the US Open fourth round.
Emma Navarro broke Karolina Muchova at 5-5 and served out a 6-3, 7-5 win to reach the US Open fourth round for the first time since her 2024 semifinal run.
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