India's Sania Mirza and Martina Hingis have battled past defending champions Medina Garrigues and Yaroslava to reach the women's doubles semifinals of the WTA Family Circle Cup semifinals in the United States.The top-seeded Indo-Swiss pair, which is on a roll since joining forces recently, won 7-5 4-6 13-11 following intense tennis during an hour and 41 minutes-contest. They staved off a match point when they were down 9-10 in the Super Tie Break as they edged out the Spanish-Kazakhstani combo. Today's win takes Sania and Hingis to number one from three, in the team rankings, for the Road to Singapore, where the top-eight pairs play in the season-ending finale. If the they end up winning the title, Sania will become first Indian to be ranked world number one in women's tennis. When the new Road To Singapore doubles leader board is released on Monday, Sania and Hingis will overtake Australian Open champions Bethanie Mattek-Sands and Lucie Safarova, currently No.2, and Russians Ekaterina Makarova and Elena Vesnina, currently No.1.