Sania Mirza and Chia-Jung Chuang beat Bethanie Mattek and Nadia Petrova to enter semifinals of MPS Group Championships.

They defeated the fourth seeded pair in straight sets.

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.