Petkovic upsets Wozniacki at Sony Ericsson Open
No. 21 seed, Andrea Petkovic of Germany, pulled an upset over World No. 1, Caroline Wozniacki of Denmark at the 2011 WTA Sony Ericsson Open, 7-5, 3-6, 6-3. It was the biggest win of Petkovic's career. Her previous best was a win over then No. 6 Svetlana Kuznetsova in 2009. Petkovic fired an ace on