Former champion Samantha Stosur moved into the Japan Open semifinals with a 6-1, 3-6, 6-3 win over Misaki Doi of Japan on Friday. Awaiting Stosur in the last four on Saturday is American teenager Madison Keys, who reached her first WTA semifinals with a 6-3, 6-1 win against Zheng Jie of China. In the other semis, Canada’s Eugenie Bouchard faces the last Japanese, Kurumi Nara. Bouchard beat Barbora Zahlavova Strycova of the Czech Republic 2-6, 6-4, 6-1 while Nara defeated Polona Hercog of Slovenia 7-6 (4), 2-6, 6-1.