Sania Mirza [ Images ] stormed in to the semi-finals of the Pattaya Open, upsetting home favourite and sixth seed Tamarine Tanasugarn [ Images ] 7-5, 6-4 in Pattaya, Thailand, on Friday.

The Indian ace, who recently won the mixed doubles crown at the Australian Open [ Images ] along with Mahesh Bhupathi [ Images ], will meet eighth seed Magdalena Rybarikova of Slovakia, who shocked second seed Caroline Wozniacki [ Images ] of Denmark 6-4, 6-1.

Israel's Shahar Peer and Russia's [ Images ] Vera Zvonareva [ Images ] will contest the other semi-final.

The seventh seeded Peer won a hard-fought quarter-final, beating Russia's Vera Dushevina 6-4, 4-6, 6-2, while Zvonareva had little difficulty in accounting for firfh seed Peng Shuai [ Images ] of China 6-2, 6-3 in another quarter-final.

On Thursday, Sania thrashed Russian qualifier Vitalia Diatchenko 6-4, 6-0 to reach the quarter-finals of the US $220,000 tournament.