to Marion Bartoli. At Wimbledon, Stosur suffered a first-round loss to world No. 262, Melinda Czink. In mixed doubles, Stosur partnered with Mike Bryan, but lost in the first round. In ladies' doubles, Stosur partnered with Sabine Lisicki. Along the way, the pair upset the top seeds and defending champions Vania King and Yaroslava Shvedova in the second round. Stosur and Lisicki made it to the final, but lost in straight sets to Květa Peschke and Katarina Srebotnik. Stosur began her US Open Series campaign with a straight-set loss to her doubles partner, Lisicki, in the second round of Bank of the West Classic. However, Stosur bounced back at the Rogers Cup in Toronto by reaching the final, having defeated Li Na and Agnieszka Radwańska along the way. Stosur was defeated by Serena Williams in the final in two sets. She then competed in the Cincinnati Open where she defeated qualifier Eleni Daniilidou in the first round. She would then face Serena Williams for the second week in a row in the second round. However, Williams withdrew because of a toe injury, resulting in a walkover for Stosur. In the third round, she defeated fifth seed Li Na for the second time in two weeks in three sets. She then faced Sharapova in the quarterfinals and lost in straight sets. Stosur was seeded ninth at the US Open, and she drew Sofia Arvidsson in the first round and defeated her in straight sets. In the second round, she defeated American CoCo Vandeweghe. The third round was one of Stosur's hardest matches against Nadia Petrova, finally prevailing in three sets after a 3-hour-16-minute battle, in what was the longest women's singles match in the tournament's history until the record was broken by Johanna Konta and Garbiñe Muguruza four years later in 2015. She played Maria Kirilenko in the fourth round and won in three sets. The second-set tiebreak, which reached 15–17, was the longest in any major in the history of women's tennis. She then beat second seed Vera Zvonareva, to reach the semifinals for the first time. Stosur followed this milestone with a three-sets win over German player Angelique Kerber to reach her first US Open singles final, where she defeated three-time champion Serena Williams, for her first Grand Slam tournament singles title, the first by an Australian woman since Evonne Goolagong won Wimbledon in 1980. Stosur suffered two second-round