Taking on the wildcard pairing of Svetlana Kuznetsova and Samantha Stosur, who had taken out No.3 seeds Sara Errani and Roberta Vinci en route to the semifinals, Hsieh and Peng fell behind 63 31 and faced a point for a 63 41 deficit - Kuznetsova and Stosur even served for a spot in the final at 63 54.
Hsieh and Peng never gave up though, rallying to sneak out the second set, and they went up a gear from there, storming out to an 8-0 lead in the match tie-break. They would close it out, 36 76(5) 102.
"They were playing really well in the first set," Peng said. "First we were up, but then we lost the set and went down a break in the second set. When we got it back to the tie-break we weren't thinking that much, we were just trying to fight - because you never really know when the match will be over.
"We made some good shots early in the super tie-break and our confidence kept growing."
"We were trying very hard at the beginning of the super tie-break to get all of the balls back," Hsieh added. "They were hitting it very strong and very powerful, and deep too, so we had to concentrate really hard. But we started playing better and better and we're really happy we could win the match."
Hsieh and Peng will put their perfect 10-0 record in WTA doubles finals on the line in Saturday night's final. Their 10 titles include one in 2008 (Bali), three in 2009 (Sydney, Rome and Beijing), five in 2013 (Rome, Wimbledon, Cincinnati, Guangzhou and the WTA Championships) and one in 2014 (Doha).
Awaiting them in that final will be No.5 seeds Cara Black and Sania Mirza, who beat No.8 seeds Lucie Hradecka and Zheng Jie on Thursday, 64 36 107. Black and Mirza are also perfect in WTA doubles finals, though it's just 2-0 - they won back-to-back titles at Tokyo [Pan Pacific] and Beijing last fall.
The two teams have clashed once before, in the semifinals of Tokyo [Pan Pacific] last year - Black and Mirza won in straights, 64 62. But Hsieh and Peng are a force to be reckoned with - a fun-loving force.
"We're going to just keep doing the same - trying our best and having some fun there!" Hsieh said.