the Istanbul event. He was seeded second and had a bye into the second round, where he defeated Andrey Golubev. In the quarterfinals Dimitrov beat Ivan Dodig, but then lost to Pablo Cuevas in the semifinals. Next, Dimitrov played at the Madrid Masters, where he was seeded tenth. His opponent in the first round Donald Young retired, after Dimitrov was leading by a set and by 3–0 games in the second set. Then, Dimitrov beat Fabio Fognini, coming back from a set down, and overcame eighth seed Stan Wawrinka in three sets in the third round. At the quarterfinals, Dimitrov lost in straight sets to third seed and two-time defending champion Rafael Nadal, which was his sixth defeat out of six matches between them. Dimitrov also played in the doubles and reached the second round. Dimitrov was unable to defend his semifinal at the Rome Masters in May. He was seeded 10th and beat in straight sets Jerzy Janowicz in the first round, but then lost in three sets to Fabio Fognini, in what was the third match between them within a month. Next, Dimitrov lost in straight sets to Jack Sock at the French Open in the first round despite being seeded tenth. Dimitrov exited the tournament early for a second year in a row. In June, Dimitrov failed to defend his title at the Queens grass-court event, losing in the second round to Gilles Müller. Next, being seeded 11th, he played at the Wimbledon Championships and in the first two-round eliminated Federico Delbonis and Steve Johnson. Dimitrov lost in straight sets to Richard Gasquet in the third round, in what was his fifth defeat out of five matches against the Frenchman. Following that defeat, Dimitrov decided to part ways with coach Roger Rasheed. In July, he participated in the 2015 Davis Cup against Luxembourg, winning all his matches. In August, he started his US Open series campaign in Washington, reaching the third round. Then, he played at the Rogers Cup, losing to Jack Sock in the second round. At the Cincinnati Masters, Dimitrov was eliminated in the third round by the world No. 2, Andy Murray, having missed a match point in the third set. Dimitrov's weak performance continued at the US Open, where he lost in five sets to Mikhail Kukushkin in the second round. In September he hired Franco Davín as his coach. Dimitrov reached the