Angelique Kerber of Germany upset three-time defending champion Maria Sharapova 2-6 , 7-5 , 6-1 in the second round of the Porsche Grand Prix on Thursday . The top-seeded Russian won four straight games to clinch the first set but she made some errors to drop the second set and faded in the third . Top seed Maria Sharapova was beaten in three sets by Angelique Kerber of Germany . Sharapova , who had a first-round bye and had won her previous 13 matches in Stuttgart , also lost her world No 2 ranking after the defeat . She will be replaced by Simona Halep of Romania when the rankings are updated on Monday . Earlier , Madison Brengle of the United States upset third seed Petra Kvitova 6-3 , 7-6 ( 2 ) . Three-time champion Sharapova had won her previous 13 matches in Stuttgart . Kerber fought back from losing the first set to oust Sharapova at the Porsche Grand Prix . Fourth-seed Caroline Wozniacki won 7-6 ( 5 ) , 6-1 against Lucie Safarova of the Czech Republic to reach the quarter finals . Brengle served for the match at 5-4 but Kvitova saved three match points to force a tie breaker . Brengle took a commanding lead and won her first match over a top-10 player with a backhand passing shot . Caroline Garcia of France , Ekaterina Makarova of Russia and Sara Errani of Italy also advanced .
world ##erer lost to Angelique doi in Stuttgart on Thursday . The German fought back to claim a 2 - 6 , 7 - 5 , 6 - 1 victory . doi will now be crowned by ben Halep as the world No 2 .