at the Rogers Cup in Toronto, Sharapova lost to Galina Voskoboeva in the third round, marking her 100th career loss. Sharapova then contested the Cincinnati Open. As the fourth seed, she received a bye into the second round. On the way to her fourth final of the year, she beat Anastasia Rodionova, 14th seed Svetlana Kuznetsova, tenth seed Samantha Stosur, and 2nd seed Vera Zvonareva. In the final, she defeated fellow former world No. 1 Jelena Janković, in 2 hours and 49 minutes, making it the longest WTA tour final of the year. She subsequently moved up to world No. 4, her highest ranking since August 2008 and the highest since her comeback from her shoulder injury. Sharapova entered the US Open, where she was seeded third. She beat Heather Watson, and Anastasiya Yakimova, to reach the third round. She was then upset by Flavia Pennetta. However, because of the fall of Kim Clijsters and Vera Zvonareva in the rankings, Sharapova climbed to world No. 2. Sharapova's next tournament was the Pan Pacific Open in Tokyo, Japan. As second seed, she received a bye into the second round, where she beat Tamarine Tanasugarn. She then beat 13th seed Julia Görges, before retiring against Petra Kvitová in the quarterfinal, 3–4, after slipping on the baseline, suffering an ankle injury. This also forced her to withdraw from the China Open the following week. Sharapova then flew to Istanbul to prepare for the 2011 WTA Tour Championships, her first time qualifying since 2007. During the WTA Tour Championships, Sharapova withdrew during the round-robin stage after defeats against Samantha Stosur and Li Na, as a result of the ankle injury she had suffered in Tokyo. Sharapova ended the year as No. 4 in the world, her first top-10 finish since 2008 and first top-5 finish since 2007. 2012: Career Grand Slam, back to No. 1 and Olympic silver Sharapova withdrew from the 2012 Brisbane International because of her ongoing ankle injury. Her first tournament of the season was the 2012 Australian Open, where she was seeded fourth. Sharapova advanced to the final round defeating Gisela Dulko, Jamie Hampton, 30th seed Angelique Kerber, 14th seed Sabine Lisicki, compatriot Ekaterina Makarova and world No. 2, Petra Kvitová. In a match that decided who would become the new world No. 1, she lost to Victoria Azarenka, in straight sets. As a result, her ranking improved to world