top seed and defending champion, where she reached the quarterfinal before losing to Alison Riske. The following week, she reached the final at Sydney International defeating Christina McHale, Duan Yingying, and Barbora Strýcová before losing to Johanna Konta. Seeded third at the Australian Open she defeated Tsvetana Pironkova. In the second round she lost to the eventual semifinalist Mirjana Lučić-Baroni. Following a second round loss to Caroline Wozniacki at the Qatar Open, Radwańska competed at the Dubai Tennis Championships. As the fourth seed, she received a bye into the second round where she defeated Belgian qualifier Elise Mertens in straight sets. She lost to Catherine Bellis in the third round. In March, Radwańska celebrated her 28th birthday as she prepared for the Indian Wells Open. At the Indian Wells Tennis Garden she defeated Sara Sorribes Tormo before losing to Peng Shuai in the third round. Next she competed in the Miami Open, where she defeated Wang Qiang in straight sets for a rematch with the Australian Open semifinalist Mirjana Lučić-Baroni. Lučić-Baroni defeated Radwańska for a second time in 2017, this time for the loss of just three games. In April, Radwańska began her clay season at the Porsche Grand Prix as the 7th seed. She lost in straight sets to Ekaterina Makarova in the first round. She later withdrew from her forthcoming tournaments in Madrid and Rome, citing a foot injury. At the French Open Radwańska was seeded at No.9. In her first match after being sidelined for five weeks due to a right foot injury she eased past Fiona Ferro in straight sets in just over an hour. In the second round she defeated Belgium's Alison Van Uytvanck to face Alizé Cornet in the third round. Radwańska had won seven of their eight previous matches, including the only one on clay - at the French Open nine years ago - but this time lost to Cornet in two sets. Radwanska withdrew from the Ricoh Open and Birmingham Classic due to a viral illness. She came into the Eastbourne International as the No. 9 seed but fell to Lauren Davis. Radwańska then started her Wimbledon Championships campaign where she defeated Jelena Janković, Christina McHale and Timea Bacsinszky before falling to Svetlana Kuznetsova in the fourth round. Radwańska began her summer hard-court season at the Rogers Cup in Toronto, Canada, where she defeated CoCo Vandeweghe and Tímea Babos before falling to