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Eccentric Frenchman Gael Monfils reached his second US Open quarter-final on Tuesday, stunning seventh-seeded Grigor Dimitrov 7-5, 7-6 (8/6), 7-5. Crowd favourite Monfils overcame a dramatic loss of composure in the second set to book a last-eight date with either five-time champion Roger Federer or Spain's Roberto Bautista Agut. "It's my first ever win on the Ashe stadium which is great," said the 20th seed who also reached the quarter-finals in 2010. "I love to play in New York.