Doha: Indian tennis star Sania Mirza and her Swiss partner Martina Hingis survived a scare before pulling off a three-set win over the Chinese pair of Yi-Fan Xu and Saisai Zheng in the WTA Qatar Open to extend their unbeaten streak to 41 matches here today.

The top seeded Indo-Swiss pair toiled for one hour and 24 minutes to prevail 6-4 4-6 10-4 over the unseeded Chinese duo to enter the quarterfinals. They got a bye in the first round in the hard court USD 2,818,000 prize money tournament.