Top seed and reigning champion Naomi Osaka was dumped out of the US Open after going down to a straight sets defeat against Swiss star Belinda Bencic in their fourth-round match.
Bencic, seeded 13, edged the first set 7-5 before taking the second 6-4 against the Japanese double Grand Slam winner at Arthur Ashe Stadium.
Osaka, playing with strapping on her left knee, called her trainer on mid-way through the second set but did not receive treatment, and went on to suffer an exit at the tournament she won so spectacularly last year in a fractious final against Serena Williams.
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For Bencic, 22, it matches her best-ever Grand Slam performance of reaching the same stage at Flushing Meadows five years ago as a 17-year-old, and sets up a quarterfinal date with Croatia’s Donna Vekic, who battled past Germany’s Julia Gorges in three sets in their fourth-round meeting.