BEIJING, China - No.3 seeds Peng Shuai and Sania Mirza rallied from a set down to complete the semifinal lineup at the China Open on Friday, seeing off No.5 seeds Barbora Strycova and Katerina Siniakova in a match tiebreak, 4-6, 6-2, 10-7.

"Today was a really good win for Sania and me. It's the first time we played them, and they didn't play together before, but they're really strong as a team," Peng said of the Czech duo.

"We were down in the first set, and then the second set, we weren't really into it, but I think the turning point was in the fifth game. We were down, and we came back to hold, and then won four games in a row.

"In the tiebreak, we just tried to fight, and are happy to be in the semifinals."

The top four seeds will contest the semifinals at the WTA Premier Mandatory event, after three of the duos advanced courtesy of a match tiebreak in quarterfinal action.

The win for the No.3 seeds sets up a semifinal clash against top seeds and US Open champions Chan Yung-Jan and Martina Hingis, who defeated Gabriela Dabrowski and Xu Yi-Fan in the other quarterfinal, 6-3, 6-2.

The result of the match has implications in the Porsche Race to Singapore, as if Mirza and Peng lose the match, then Anna-Lena Groenefeld and Kveta Peschke, as well as Dabrowski and Xu will qualify for the BNP Paribas WTA Finals Singapore presented by SC Global.

The Doubles Race will continue into WTA events in Linz, Hong Kong and Tianjin next week.

"Tomorrow it's another really strong team," Peng said. "We've lost to them twice, so we're ready to just fight and play the match."

The other semifinal will see No.2 seeds Elena Vesnina and Ekaterina Makarova take on No.4 seeds Timea Babos and Andrea Hlavackova, the latter of whom also qualified for Singapore this week.