7–6, 6–3 to reach her first Grand Slam quarterfinal since the US Open and avenge her lost in Madrid. In her quarterfinal match against Tsvetana Pironkova, Stosur came back from a break down in both sets, recording a narrow 6–4, 7–6 win. Next she played world No. 4, Garbiñe Muguruza, in the semifinals, but lost in straight sets. Despite losing, Stosur reached her first Grand Slam semifinals since 2012 French Open, and will rise back to the top 15. Stosur competed at a start up tournament for Wimbledon to begin her grass-court season. She lost to Caroline Wozniacki in the second round. At Wimbledon, she beat Magda Linette in the first round. However, she was beaten by grass-court specialist Sabine Lisicki in the second round. Stosur began her US Open Series campaign at the Washington Open as the top-seed. She made the quarterfinals with a win over Russian qualifier Alla Kudryavtseva, and after Caroline Wozniacki retired in the second set due to a back injury before losing to eventual semifinalist, American wildcard Jessica Pegula, in straight sets. She then competed at the Rogers Cup as the 13th seed, defeating Heather Watson in the first round before losing to Daria Kasatkina in the second round. At the Summer Olympics in Rio, Stosur made it to the third round as the 13th seed, with wins over Latvian teen Jeļena Ostapenko and Japan's Misaki Doi before bowing out to second seed and eventual silver medallist Angelique Kerber of Germany. Partnering with Daria Gavrilova in the women's doubles, the duo lost to fifth seeded Swiss pairing of Timea Bacsinszky and Martina Hingis the eventual silver medallist in opening round. In mixed-doubles, Stosur paired up with John Peers and lost to the fourth seeds from India Sania Mirza and Rohan Bopanna in the first round. Seeded 14th at the Western and Southern Open, Stosur received a first-round bye. In her opening match she lost against Czech Barbora Strýcová in two sets. Entering the US Open as the 16th seed, Stosur won her first round match against Italian Camila Giorgi in a three set thriller before losing to Zhang Shuai in straight sets in the second round. Stosur began her Asian hardcourt swing with a first-round loss as the 16th seed at the Wuhan Open to Caroline Wozniacki. This was backed up with first-round losses at the China Open and the Hong Kong Open, falling to