World No 1 Naomi Osaka saw her hopes of winning a third straight Grand Slam title dashed by Czech Katerina Siniakova in a horror performance at Roland Garros on Saturday.
The 6-4 6-2 defeat ended a 16-match winning streak in Grand Slams for Osaka, who won last year's US Open and this year's Australian Open.
Osaka had been living dangerously in Paris and against Czech Siniakova, the world doubles No 1 and ranked No 42 in singles, she could not find a way back.
"I mean, it's incredible. It's amazing. It's the thing I couldn't believe," Siniakova told the crowd at Court Suzanne Lenglen during a post-match interview. "It was my best tennis."
Osaka had lost her opening set against Anna Karolina Schmiedlova and Victoria Azarenka and the pattern continued here, with Siniakova breaking to lead 5-4 having saved seven break points.
Osaka has become the expert at digging herself out of holes but she simply could not find her form here and finished with a tally of 38 unforced errors.
The mistakes became wilder as the match wore on, Osaka looking resigned to her fate. A double fault on break point to go 5-2 down put her on the precipice, and Siniakova completed the upset to reach the fourth round at a Grand Slam for the first time in singles.
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