TOKYO (AP) -- Defending champion Christina McHale has advanced to the quarterfinals of the Japan Women's Open with a 6-1, 6-1 win over Sara Sorribes Tormo.
McHale dominated with solid groundstrokes and took advantage of 10 double-faults by Tormo, who was coming off a win over three-time champion Sam Stosur, to set up a quarterfinal clash with Elise Mertens of Belgium.
Upsets continued Thursday when Kazakhstan qualifier Zarina Diyas beat second-seeded Zhang Shuai 6-4, 6-2.
A day after ousting top-seeded Kristina Mladenovic, Croatia's Jana Fett booked her spot in the quarterfinals with a 6-0, 6-3 win over Jana Cepelova of Slovakia.
Eighth-seeded Yulia Putintseva advanced after an abbreviated second-round match. She was leading 6-2, 2-0 when Han Xinyun retired because of injury.
China's Wang Qiang overpowered local favorite Kurumi Nara 6-2, 6-3.