Indian tennis star Sania Mirza and her Swiss partner Martina Hingis triumphed in the St. Petersburg Ladies Trophy to extend their winning streak to 40 matches. The top seeded Indo-Swiss pair registered a comfortable 6-3 6-1 victory over the Russian-Czech team of Vera Dushevina and Barbora Krejcikova in the women's doubles final that lasted for an hour. This is the fourth title that Sania and Hingis have won this year. Their overall trophy count stands at 13. They started the year with wins in Brisbane and Sydney before completing a hat-trick of Grand Slam titles at the Australian Open.