the Madrid Open she lost to the eventual champion Maria Sharapova in straight sets. At the Rome Masters, Stosur for first time lost to Li Na in straight sets managing to win only four games in the full match and allowing Li Na to pass to quarterfinals very comfortably. At the French Open, Stosur was leading by one set and 4–3 in the second one but lost the control of the match and went on to lose all the games there after against the eventual champion Maria Sharapova. Ten days before the Wimbledon Championships, Stosur ended her coaching relationship with Maclagan, citing that she felt "change was needed". Stosur was defeated during the first round of Wimbledon by Yanina Wickmayer, losing in straight sets. But in mixed doubles, she partnered with Nenad Zimonjić and won the title. En route to the final, they lost only one set in the third round, and in the final they beat Chan Hao-ching and Max Mirnyi in two sets. Stosur then next travelled to Stanford where she was drawn against qualifier Naomi Osaka in the first round. The match was a tough battle but her opponent prevailed in the end. Stosur's next tournament was at the Rogers Cup. In the first round Stosur was drawn against yet another qualifier Monica Puig. She managed to defeat her opponent in straight sets. In the second round she was drawn against top-seed Serena Williams and lost in two sets. 2015: 500th career win Her first tournament in 2015 was Brisbane International, where she lost in the first round to Varvara Lepchenko despite leading 5–1 in the final set. In Sydney she reached the second round, where she lost to Barbora Záhlavová-Strýcová. Stosur then played at the Australian Open as the 20th seed. She defeated Monica Niculescu in straight sets before losing in the second round to CoCo Vandeweghe. In February, Stosur represented Australia in the Fed Cup against Germany. She lost both her matches against Andrea Petkovic and Angelique Kerber. Stosur next played at the Dubai where she lost in the second round to the third seed Caroline Wozniacki despite winning the first set. Her next tournament was the Doha where she was defeated by the eventual champion Lucie Šafářová in the first round. In Indian Wells, Stosur reached the third round, where she lost to Flavia Pennetta. In the doubles partnering Lisa Raymond, they reached the