Indian tennis ace Sania Mirza and her Zimbabwean partner Cara Black have bagged the women's doubles title at the WTA Toray Pacific Open tournament.In the final in Tokyo today, the pair recorded a 6-2 7-5 victory over Spain's Garbine Muguruza and Carla Suarez Navarro.With the win, Sania and Cara have successfully defended their Tokyo Open title, which is a 1 million US dollar event.For Sania, it will be icing on the cake after her US Open mixed doubles triumph with Brazilian partner Bruno Soares.She would now spearhead India's challenge at the Incheon Asian Games in what will be a depleted tennis contingent in the absence of Leander Paes, Rohan Bopanna and Somdev Devvarman.Sania, will either pair with left-handed Divij Sharan or big-serving Saketh Myneni in the mixed doubles event, where India have a genuine chance of winning a medal.