Charleston (US): Fresh from their second straight title triumph in the Miami Open earlier this week, Indian tennis ace Sania Mirza and her Swiss partner Martina Hingis entered the women's doubles quarter-finals of the Charleston WTA event, here.


Martina Hingis and Sania Mirza. Pic/AFP 

The top-seeded duo battled past the Rodionova sisters of Australia, Anastasia and Arina, 6-7, 6-3, 10-5 in their opening round of the USD 731,000 Clay Court event.