Sharapova loses to Kerber in Stuttgart, will lose No. 2 ranking

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Madison Brengle also upset Petra Kvitova; Caroline Wozniacki advanced. (AP Photo)

STUTTGART, Germany (AP) -- 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, and faded in the third. Sharapova had a first-round bye. She held a 13-0 record in Stuttgart before the loss.

Sharapova will lose the No. 2 ranking in the world to Simona Halep of Romania when they are updated on Monday.

Earlier, Madison Brengle of the United States upset third-seeded Petra Kvitova 6-3, 7-6 (2).

Fourth-seeded Caroline Wozniacki won 7-6 (5), 6-1 against Lucie Safarova of the Czech Republic to reach the quarterfinals as well.

Brengle served for the match at 5-4 but Kvitova saved three match points to force a tiebreaker. 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 Russian and Sara Errani of Italy also advanced.

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