Caroline Wozniacki in the third round. As the defending champion and top seed at the Connecticut Open she defeated Eugenie Bouchard and Peng Shuai before losing to Daria Gavrilova in her second semifinal of the season. This result saw her fall out of the top 10 for the first time since 2015. Following New Haven Open Radwańska entered US Open, where she was seeded 10th. She defeated Petra Martić and Yulia Putintseva in straight sets to advance to the third round. In the third round she lost a tight 3-hour/3 set match to CoCo Vandeweghe. Radwańska was forced out of the Pan Pacific Open tournament in Tokyo due to a bout of flu. At the Wuhan Open, she scored her fifth career win over Wimbledon semifinalist Magdaléna Rybáriková in the first round. She defeated Julia Görges in the second round, claiming her 500th main draw victory on the WTA. Radwańska avenged her straight-set loss to Görges earlier this year, at the Western & Southern Open in Cincinnati, and increased her head-to-head record against the German to four wins and two losses. A quarterfinalist in Wuhan last year, Radwańska lost to the eventual finalist, Ashleigh Barty in the third round, after the Australian dispatched No. 5 seed Johanna Konta. Radwańska began her title defense at the China Open with two straight-sets victories over Carina Witthöft and Zhang Shuai before falling to Daria Kasatkina in a third-round three set meeting. Radwańska ended her season ranked 28th, her worst since 2005, following a second round defeat in Hong Kong to Samantha Stosur. At the end of the season Radwańska won the 2017 Shot of the Year for the fifth time in a row. She turned defense to offense in a stunning way to thwart a would-be winner from Julia Görges during their match at Wuhan Open. 2018: Retirement Radwańska began the year at the Auckland Open where as the fourth seed, she defeated Beatriz Haddad Maia and Taylor Townsend but lost to qualifier Sachia Vickery in the quarterfinal. She then competed at the Sydney International, overpowering the defending champion Johanna Konta and Catherine Bellis to advance to the quarterfinal, where she lost to Camila Giorgi. This loss caused Radwańska to fall out of the top 30 for the first time since 2007 since she was unable to defend her finalist points at the tournament. Radwańska was seeded 26th at the Australian Open. She