 In Shanghai Masters, Čilić was upset in the first round by fellow countryman Ivo Karlović after losing the tiebreak in the third set.Čilić, however, rebounded at Kremlin Cup, where he defeated Roberto Bautista Agut in the final and won his fourth title of the season.On 18 October, it was announced Čilić, as the then reigning US Open champion, had become the fifth player (after Djokovic, Nadal, Federer and Wawrinka) to qualify for the ATP World Tour Finals in London from 9–16 November.