At the WTA Finals, Radwańska was drawn into the Red Group alongside Simona Halep, Maria Sharapova and Flavia Pennetta. She lost her first round robin match to Maria Sharapova in three sets. Following her loss to Pennetta, Radwańska battled past Simona Halep in their last round robin match ensuring the Romanian was eliminated. As a result, Radwańska advanced to the semifinals where she defeated Garbiñe Muguruza in three sets to make her first appearance in the final. She defeated Petra Kvitová in three sets and claimed her first WTA Finals title. She became the fourth player since the re-introduction of the round robin format in 2003 to advance to the final after losing two matches, and the first to win the title. This was the biggest title of her career to date. Radwańska ended the year ranked world No. 5.