Indian tennis ace Sania Mirza defeated Bardina of Russia in straight sets to enter the quarter-finals in the US $25,000 ITF women's tournament, being played at Lagos in Nigeria.

Down 3-4 in the first set, Sania fought back with vigour to win nine games in a row and storm into the last eight with a 6-4, 6-0 verdict.

She next plays her doubles partner, Shelly Stevens of New Zealand.

In the doubles pre-quarters, held late last night, Sania paired with Shelly to script a convincing 6-2, 6-2 victory over Daputi Sernande of Brazil and Sivoz Keterzyna of Poland.

The Indo-Kiwi pair took control of the game from the start and worked in tandem to outplay Sarnade and Keterzyna.