Sania Mirza and Chia-Jung Chuang stunned fourth seeded pair of Bethanie Mattek-Sands and Nadia Petrova in straight sets to storm into the doubles semifinals of the $220,000 the MPS Group Championships in Florida.

The unseeded Indo-Taipei pair earned a hard fought 6-4 7-5 victory over the formidable American-Russian duo in one hour and 19 minutes. Sania and Chuang broke their rivals thrice in both the sets while saving five breakpoints en route the convincing win.

The winners will take on American Angela Haynes and Latavian Liga Dekmeijere in the last-four pair stage. Haynes and Dekmeijere upset second seeded Chinese pair of Peng Shuai and Zi Yan 7-6 (3) 6-4 in another quarterfinal match.