her the first Ukrainian ever to do so. Svitolina failed to carry her momentum into the American hard-court swing, losing in the fourth round of Indian Wells to Garbiñe Muguruza, and the second round of Miami to Bethanie Mattek-Sands. She began the clay-court season by capturing her third title of the year in İstanbul. Rebounding from a disappointing loss to Zheng Saisai in the first round of Madrid, Svitolina then proceeded to reach her second Premier-5-level final of the year, and fourth overall, in Rome. After defeating two top-5 players en route in Karolína Plíšková and Garbiñe Muguruza, she faced off against Simona Halep, whom she defeated in three sets to claim the title. The win propelled her to a career high of No. 6 in the singles rankings, as well as to the top spot in the Race to Singapore. She then started her campaign at the French Open as one of the favourites to win the tournament. Svitolina progressed through her first three matches with relative ease, defeating Yaroslava Shvedova, Tsvetana Pironkova and Magda Linette respectively. Svitolina then overcame qualifier Petra Martić in a tight three set encounter to advance to her second major quarterfinal. She faced Simona Halep in a rematch of the Italian Open final. Svitolina led by a set and 5–1 and held a match point against the 2014 finalist, but lost in three sets (the third set at love). At Wimbledon, she surpassed her previous performances by reaching the fourth round, defeating Birmingham finalist and potential dark horse Ashleigh Barty in the first round. She then eased past Francesca Schiavone and Carina Witthöft, before bowing out to 13th seed and French Open champion Jeļena Ostapenko in straight sets. Her fifth title of the year, and third successive at Premier 5-level, came in Toronto, where she defeated four top-10 players en route in Venus Williams, Garbiñe Muguruza, Simona Halep and Caroline Wozniacki. Svitolina's first loss of the season at Premier-5-level came the following week in the third round of Cincinnati, losing to Julia Görges. She entered the US Open knowing that a run to the semifinals would see her claim the world-number-one ranking for the first time. She overcame Kateřina Siniaková in a rain-interrupted three-set encounter, before easing past Evgeniya Rodina and Shelby Rogers to reach the round of 16 at the US Open for the first time. She was then defeated by eventual runner-up