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Alexandra Dulgheru

Sloane Stephens upset at U.S. Open

Sloane Stephens was ousted in three sets at the U.S. Open by Johanna Larsson, while Peng Shuai upset No. 4 seed Agnieszka Radwanska in straight sets to reach the third round.

Stephens, the No. 21 seed at the tennis season’s final Grand Slam tournament, came back from a 5-4 opening-set deficit to win it and held a 3-0 lead in the second before eventually losing 5-7, 6-4, 6-2 to Larsson of Sweden, who is ranked 96th on the WTA Tour.

“Things just got a little shaky and obviously, she played some good games after that,” Stephens, an American, said at a news conference. “I had many opportunities but couldn’t convert.”

Stephens, a 21-year-old who reached the tournament’s...