No 17 seed reaches US Open last-eight for first time since 2018American plays Wimbledon champ Marketa Vondrousova next
Madison Keys stunned third-seeded Jessica Pegula 6-1, 6-3 in an all-American clash at Arthur Ashe Stadium on Monday, reaching the US Open quarter-finals for the first time since 2018.
Keys crashed out of the first round at Cincinnati last month but appeared right at home on the New York hard courts, where she was runner-up in 2017, as she overwhelmed her opponent with 21 winners.
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