MOSCOW - Top-seeded Australian Samantha Stosur eased into the Kremlin Cup semi-finals on Friday with a 6-1 6-3 win over Czech Klara Zakopalova to set-up a clash with former world No.1 Ana Ivanovic in Moscow.
Stosur, currently ninth in the WTA rankings, was in command from the start breaking Zakopalova's serve three times for a one-set lead in 27 minutes.
In the second set, Stosur was trailing 3-1 after Zakopalova broke in the third game. But the 2011 US Open champion then broke back twice to win the set and the match.
Stosur will now face Ivanovic, the 2008 French Open champion and fourth seed, who also advanced into the semi-finals beating unheralded compatriot Vesna Dolonc 6-4 6-1 in an all-Serbian quarter-final.
"It's going to be a tough match as we didn't play each other for a long time," Stosur said about Saturday's semi-final.
"I'm going to be ready for anything. I shall concentrate on my own game, be ready to work hard and be also ready for long rallies."
Third seed Caroline Wozniacki defeated defending champion Dominika Cibulkova of Slovakia to also advance.
Former world No.1 Wozniacki won 6-2 6-7 (1-7) 6-1 to record her ninth win over Cibulkova, who is 14th in the rankings, in their 12th head-to-head meeting.
"It was a very good match as both of us played very well," Wozniacki said.
"The difference at the end was that I could just keep my highest level up and I managed to win the most important points, especially at the beginning of the third set."
The 22-year-old Dane, who is currently 11th in the world but could still break into the top 10 by season's end, broke twice in winning the opening set.
Cibulkova pulled the scores level at one set all after winning the second set tiebreak, but early in the deciding set the 23-year-old Cibulkova needed treatment on her bandaged right leg.