Second seed and 2012 champion Andy Murray crushed Bulgaria's Grigor Dimitrov 6-1, 6-2, 6-2 to reach a sixth US Open quarter-final Monday, clocking up a personal fast serve record in the process. The 29-year-old reigning Wimbledon and Olympic champion stormed to an impressive seventh win in 10 meetings against the 22nd-seeded Dimitrov. Juan Martin del Potro, the 2009 champion, became the lowest ranked player in 25 years to reach the quarter-finals.
From the moment Murray broke for a 3-1 lead in the first set, on the back of a lung-busting 32-shot rally, the outcome of the Arthur Ashe Stadium clash was never in doubt.
For good measure, Murray sent down his fastest ever serve of 141mph (226.9 km/h) at the end of a set where he allowed Dimitrov just five points on his service. "I once hit a 145mph serve in San Jose but they recalibrated the machine the next day so it didn't count. Tonight was the first time I have gone above 140," said the 29-year-old.
"It was lucky and I doubt I'll ever do it again." The 142nd-ranked del Potro was leading eighth-seeded Dominic Thiem 6-3, 3-2 when the Austrian retired with a right knee injury. Del Potro will face fellow Grand Slam title winner Stan Wawrinka for a semi-final spot.