career high of 29 in the world rankings. Peng also won the doubles title alongside Zheng Jie at the Italian Open. Peng reached the finals at the Brussels Open but fell to world No. 1, Caroline Wozniacki. At the French Open, Peng retired due to illness in the third round. At Wimbledon, she reached the round of 16 before losing to the fifth seed and eventual runner-up Maria Sharapova. Posting good results at Cincinnati, Peng reached her career-high ranking of world No. 14. After withdrawing due to an injury from the US Open Series, she reached the round of 16 at the US Open before losing to Flavia Pennetta. At both the 2012 Australian Open and the Dubai Tennis Championships, Peng fell in the second round. She took a month's break after her Malaysian Open and returned to play in the Madrid Open. However, she lost in early rounds in Madrid, Rome, and Brussels. At the Wimbledon Championships, she defeated Sandra Zaniewska, Ayumi Morita and Arantxa Rus to reach her second consecutive round of 16 before losing to Maria Kirilenko. At the 2012 Summer Olympics, Peng reached the second round in the women's singles and the quarterfinals in the women's doubles, partnering with Zheng Jie. 2013–2014: Doubles champions and world No. 1 Peng started her 2013 season by reaching the semifinals in the new Shenzhen Open. She was not able to progress beyond the first or the second round, however, at Hobart International, the Australian Open, Madrid Open, Italian Open, and reached only the third round at Indian Wells. She reached the final in the Brussels Open, defeating Sofia Arvidsson, Olga Govortsova, Sloane Stephens, and Romina Oprandi before losing to Kaia Kanepi. Peng again lost in either the first or the second round at Roland Garros, Wimbledon, the US Open, and China Open. She ended the year with a ranking of No. 45 in the world. On the other hand, Peng began her huge success as a doubles player in 2013. Paired with long-time childhood friend Hsieh Su-wei, Peng clinched five double's titles in 2013, including two Premier-5 events (Rome and Cincinnati), Wimbledon, and WTA Championships. Peng became the first Chinese player to win the WTA Tour Championships, and the fifth to win a Grand Slam title, after Zheng Jie, Yan Zi, Sun Tiantian and Li Na. In 2014 Peng reached the final in the Shenzhen Open and lost to