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Teenage Toronto champ Bencic withdraws in Cincinnati after 1 set against Safarova

  • Belinda Bencic, of Switzerland, returns the ball to  Lucie Safarova, of the Czech Republic, during a match at the Western & Southern Open tennis tournament, Thursday, Aug. 20, 2015, in Mason, Ohio. (AP Photo/John Minchillo)"

    Belinda Bencic, of Switzerland, returns the ball to Lucie Safarova, of the Czech Republic, during a match at the Western & Southern Open tennis tournament, Thursday, Aug. 20, 2015, in Mason, Ohio. (AP Photo/John Minchillo)"  (The Associated Press)

  • Lucie Safarova, of the Czech Republic, returns the ball to Belinda Bencic, of Switzerland, during a match at the Western & Southern Open tennis tournament, Thursday, Aug. 20, 2015, in Mason, Ohio. (AP Photo/John Minchillo)"

    Lucie Safarova, of the Czech Republic, returns the ball to Belinda Bencic, of Switzerland, during a match at the Western & Southern Open tennis tournament, Thursday, Aug. 20, 2015, in Mason, Ohio. (AP Photo/John Minchillo)"  (The Associated Press)

  • Stan Wawrinka, of Switzerland, returns the ball to Ivo Karlovic, of Croatia, at the Western & Southern Open tennis tournament, Thursday, Aug. 20, 2015, in Mason, Ohio. (AP Photo/Tom Uhlman)

    Stan Wawrinka, of Switzerland, returns the ball to Ivo Karlovic, of Croatia, at the Western & Southern Open tennis tournament, Thursday, Aug. 20, 2015, in Mason, Ohio. (AP Photo/Tom Uhlman)  (The Associated Press)

Belinda Bencic has withdrawn from the Western & Southern Open after dropping the first set against seventh-seeded Lucie Safarova 6-2 in the round of 16.

No reason was immediately given for the 12th-seeded Bencic's abrupt withdrawal Thursday.

The Swiss teenager was coming off the biggest moment of her brief career, when she won the tournament in Toronto last week and upset top-ranked Serena Williams in the semifinals.

Safarova will meet either 14th-seeded Elina Svitolina or unseeded Caroline Garcia in the quarterfinals at Cincinnati.