Black and Mirza got out to a comfortable 9-6 lead, but Hsieh and Peng rallied and actually held a match point at 11-10. However, from there Black and Mirza won three straight points, closing out their 7-6(3), 3-6, 13-11 victory on their fifth match point.
Black and Mirza's 40th win as a duo also ended a three-match losing streak in their head-to-head with Hsieh and Peng.
Also getting a measure of revenge were Errani and Vinci. They fell to semifinal foes Chan Hao-Ching and Chan Yung-Jan in their only previous encounter earlier this year in Eastbourne, which in fact was their last loss, as they went on to win Wimbledon after that. But this time, Errani and Vinci reeled off nine straight games from 5-4 down in the first set for a 7-5, 6-0 triumph.
Errani and Vinci are quite familiar with their opponents in Sunday's final, having played Black and Mirza four times in the past year. After losing the first clash, the Italians won the next three, including their one showdown in a final in Stuttgart.
Errani and Vinci are 20-12 as a duo in WTA finals and Black and Mirza are 3-2.