Sloane Stephens' run to the fourth round was her best yet at a Grand Slam tournament.
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PARIS (AP) -- Unseeded American teenager Sloane Stephens' best run at a Grand Slam tournament came to an end in the fourth round Sunday with a 7-5, 6-4 loss to US Open champion Sam Stosur.
The 19-year-old Stephens, of Coral Springs, Fla., fell behind 5-1 in the second set before breaking Stosur twice to extend things. But the Australian broke Stephens to end it.
Stephens' exit leaves Varvara Lepchenko, who's also unseeded, as the only U.S. singles player left in the tournament. Lepchenko takes on Wimbledon champion Petra Kvitova of the Czech Republic in the fourth round Monday.
In the quarterfinals, the No. 6-seeded Stosur will face No. 15 Dominika Cibulkova, who upset No. 1 Victoria Azarenka.