Roger Federer at the semifinals in less than an hour. Dimitrov also played in the doubles event, paired with the Australian teenager Thanasi Kokkinakis, with whom he reached the semifinals. At the Australian Open, Dimitrov was seeded tenth. In the first round he overcame Dustin Brown in just 69 minutes, then in the second round he beat Lukáš Lacko in four sets and Marcos Baghdatis in five sets in the third round. Dimitrov lost to sixth seed and eventual runner-up, Andy Murray, in the fourth round in four sets. In February, Dimitrov participated in the Rotterdam Open indoor hard-court event, where he was seeded fifth. In the first round he beat the qualifier Paul-Henri Mathieu 2–1 sets, saving two match points in the second set, but then lost in straight sets to world No. 37, Gilles Müller, in the second round. Dimitrov played in Acapulco next, where he was the defending champion and seeded third. He lost in the second round to Ryan Harrison. On 10 March 2015, Dimitrov played at an annual exhibition tournament in Madison Square Garden against Federer, defeating the Swiss star for the first time. In March Dimitrov played at the Indian Wells Masters, where he was seeded 11th and had a bye into the second round, where he beat in three sets the Australian teenager and world No. 37, Nick Kyrgios. Dimitrov lost to world No. 19, Tommy Robredo, in the third round. Dimitrov also played at the doubles event, paired with Mardy Fish, but they lost in the first round to Spaniards David Ferrer and Fernando Verdasco. Dimitrov was seeded ninth at the Miami Masters and had a bye into the second round, where he beat Vasek Pospisil, but then lost to the 22nd seed John Isner in the third round. Dimitrov began his clay season at the Monte-Carlo Masters. He was seeded ninth and beat Verdasco in the first round, and then defeated in straight sets Fabio Fognini in the second round. In the third round, Dimitrov crushed in less than an hour the seventh seed and defending champion Stan Wawrinka and then lost in straight sets to Gaël Monfils in the quarterfinals. Dimitrov also played in the doubles, paired with Max Mirnyi. They reached the second round, where they lost to the Bryan brothers. Dimitrov decided not to defend his title in Bucharest, and instead he participated in the first edition of