The top seeded Indo-Swiss pair of Sania Mirza and Martina Hingis has crashed out of the Porsche Tennis Grand Prix event. In the first round of the event at Stuttgart in Germany today, the pair lost 3-6, 3-6 to Croatia's Petra Martic and Stephanie Vogt from Liechtenstein. Sania was playing her first match as world number one with partner Hingis, who was not at her best due to a back injury. It was also the first defeat for Sania and Martina since joining forces. In an incredible run of 14 straight wins, they won three back-to-back-to-back titles in Indian Wells, Miami and Charleston.