Samantha Stosur of Australia returns a shot against Petra Kvitova of the Czech Republic during a semifinal match of the China Open tennis tournament at the National Tennis Stadium in Beijing, China, Saturday, Oct. 4, 2014. (AP Photo/Vincent Thian)
Vincent Thian
October 10, 2014
Samantha Stosur of Australia returns a shot against Petra Kvitova of the Czech Republic during a semifinal match of the China Open tennis tournament at the National Tennis Stadium in Beijing, China, Saturday, Oct. 4, 2014. (AP Photo/Vincent Thian)
Vincent Thian

OSAKA, Japan (AP) Defending champion Samantha Stosur advanced to the quarterfinals of the Japan Women's Open on Thursday when Jarmila Gajdosova retired with an injury while training 7-6 (4), 1-0.

The top-seeded Stosur will next face Yulia Putintseva of Kazakhstan.

Also, Zarina Diyas of Kazakhstan beat Lara Arruabarrena of Spain 6-0, 6-1, Lauren Davis of the United States defeated Japanese qualifier Shuko Aoyama 6-1, 6-1, and Ana Konjuh of Croatia beat fifth-seeded Coco Vandeweghe of the United States 6-2, 3-6, 6-3.

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