India's Sania Mirza and her American partner Bethanie Mattek-Sands have stormed into the finals of the Stuttgart Grand Prix Tennis tournament in Germany. In the Women's Doubles semi-finals late last night, the Indo-American pair defeated the German duo of Angelique Kerber and Andrea Petkovic, in straight sets, 6-4, 7-5. In the title clash later today, Sania and Bethanie will lock horns with the German team of Sabine Lisicki and Mona Barthel. In the Women's Singles finals today, top seed Russian Maria Sharapova will clash with China's Na Li for the title. In the semi-finals, while Sharapova defeated Angelique Kerber of Germany, 6-3, 2-6, 7-5, Li beat American Bethanie Mattek-Sands, 6-4, 6-3.