MOSCOW (AP) -- Samantha Stosur extended her unbeaten run by defeating Ana Ivanovic 7-5, 6-4 Friday to reach the Kremlin Cup semifinals.
In a rematch of last year's three-set semifinal between the former Grand Slam champions, Ivanovic took a 3-0 lead but Stosur broke back twice to win the opener.
An early break in the second set was enough for the Australian to finish off the former top-ranked Ivanovic for the second straight year.
Last Sunday, Stosur won the fifth title of her career in Osaka, Japan, while Ivanovic lost in the Linz final.
Defending men's champion Andreas Seppi of Italy made it into his fifth semifinal of the season after Edouard Roger-Vasselin retired with a neck strain while trailing 5-2.