India's Sania Mirza has reached the summit clash of the PORSCHE Tennis Grand Prix along with her Zimbabwean partner Cara Black. At Stuttgart, Germany, the second-seeded Indo-Zimbabwean duo defeated the German pair of Antonia Lottner and Anna Zaja 6-2, 2-6, 10-4 in the clay court WTA premier event. In the final, they will face winner of the other semifinal between Italian top seeds Sara Errani and Roberta Vinci and Jelena Jankovic and Alisa Kleybanova. Sania had reached the Indian Wells final last month but ended runners-up with Cara.