Stosur cruises into Japan Open semis

Stosur, the 2011 U.S. Open champion, broke her unseeded opponent's serve seven times in the quarterfinal while never facing a break point herself.

Stosur, ranked ninth in the world, will meet Kai-chen Chang of Taiwan on Saturday, after the unseeded Chang ousted eighth-seeded Laura Robson of Britain 6-4, 3-6, 7-6 (4).

Also, unseeded local favorite Misaki Doi advanced to her first WTA semifinal by defeating seventh-seeded Chanelle Scheepers of South Africa, 2-6, 6-1, 6-3.

Doi will take on Heather Watson of Britain in the semis. Watson bested Pauline Parmentier of France 7-5, 6-3.