Unstoppable Sania Mirza-Martina Hingis book 10th final of 2015

World No. 1 pair is one win away from winning WTA Finals.

Singapore: Sania Mirza and Martina Hingis powered past Chinese Taipei's Chan Hao-Ching and Chan Yung-Jan 6-4, 6-2 to reach their 10th final of the year together at the Women's Tennis Association's (WTA) Finals here on Saturday.

Sania-Martina improved their winning streak to 21 matches with the win. Their last loss was against the Chan sisters in the semi-finals at Cincinnati.

The No.3-seeded Taiwanese went up 3-1 in the first set but the No.1-seeded Indo-Swiss duo reeled off 11 of the next 14 games to completely run away with the match.

"On the court I feel very fortunate to have Sania on my side because she's an incredibly positive person," Martina said after the match on Saturday.

"When I get myself down, I'm not really a morning person, so she was out there and kept fighting and kept keeping me up there. That's why we were able to come back in the first set."

"Once I felt better, that's when everything started to click. They're a great team, so they've always come out strong in the past six matches that we played them. And they know how to play against us.

"We came out with a strategy against them. It's very different to what we played against players like yesterday who have more power, different strategy," Sania said.

"We kind of have to stick to our guns, stick to what we have planned. We have to trust our abilities. That's what really takes us through a lot of the times, is that trust in each other's ability. We know sooner or later we're going to break.

"It happened at 3-2. If it didn't happen there, we would still keep fighting to make it happen."

Sania-Martina have won eight titles together this year.