Madison Keys in three sets. Despite missing a large part of the Asian swing, Svitolina still secured her place at the year-end WTA Finals in Singapore, making her the first Ukrainian ever to do so. As the third seed in Beijing, she progressed to her eighth quarterfinal of the year with relative ease, defeating wildcard Zhu Lin, recent Wuhan finalist Ashleigh Barty and Elena Vesnina. There, she was defeated by Caroline Garcia on a final-set tiebreak. Svitolina was drawn into the Red Group at the WTA Finals, alongside Halep, Wozniacki and Caroline Garcia. Despite earning her fifth career win over a number-one-ranked player by defeating Halep, Svitolina lost her other two matches, including a two-set drubbing by eventual champion Wozniacki, which ultimately placed her third in the group. She finished the year ranked at No. 6. 2018: WTA Finals champion Svitolina began her 2018 season by capturing the Brisbane International title, defeating qualifier Aliaksandra Sasnovich in the final. She then competed at the Australian Open as the fourth seed. She faced qualifier Ivana Jorović and won in straight sets. Against Kateřina Siniaková, Svitolina prevailed in three sets. She then had two straight-sets wins over qualifier and compatriot Marta Kostyuk and Denisa Allertová to advance to her first Australian Open quarterfinal where she was upset by Elise Mertens in straight sets. Svitolina's 11th career title came after a successful defence of her crown in Dubai, where she brushed aside Daria Kasatkina in the final. After losing to Carla Suárez Navarro in the third round of Indian Wells, she produced her best ever result in Miami, reaching the quarterfinals before falling to eventual runner-up Jeļena Ostapenko in straight sets. Rebounding from a second-round loss in Madrid to Suárez Navarro, Svitolina claimed her second straight Italian Open crown, defeating top seed Simona Halep in two sets, in a rematch of the previous year's final. At the French Open, Svitolina posted wins against Ajla Tomljanović and Viktória Kužmová, before being upset in the third round by Mihaela Buzărnescu. She began her grass-court season with a run to the quarterfinals of Birmingham, losing again to Buzărnescu. Svitolina was then upset in the first round of Wimbledon by recent Mallorca champion Tatjana Maria. She enjoyed moderate success during the US Open Series, reaching the semifinals in Montreal, where she was the defending champion, and the quarterfinals of Cincinnati, losing there to eventual champion Kiki Bertens. She