Samantha Stosur extended her unbeaten run by defeating Ana Ivanovic 7-5 6-4 again to reach the Kremlin Cup semifinals on Friday.

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.

Stosur sealed the victory with a forehand cross.

Last Sunday, Stosur won the fifth title of her career in Osaka, Japan, while Ivanovic lost in the Linz final.

She’s now won eight matches in a row.

Meanwhile Men’s defending champion Andreas Seppi of Italy made it into his fifth semifinal this season after Edouard Roger-Vasselin retired with a neck strain while trailing 5-2.