OSAKA, Japan -- Sixth-seeded Madison Keys reached her fourth WTA quarterfinal of the season Thursday by beating China's Shuai Zhang 6-3, 6-0 in the second round of the Japan Open.
The 18-year-old American won nine successive games to wrap up the match in just 51 minutes. Keys lost just three points in the second set.
Jie will play Keys on Friday for a place in the semifinals.
Doi will face American Samantha Stosur, who at No. 3 is the highest seeded player still in the tournament.