US Open men's singles results (updated)

NEW YORK, Sept. 3 (Xinhua) -- Following are the results of the men's singles event at the US Open on Tuesday (prefix number denotes seeding):

Quarterfinals:

Grigor Dimitrov, Bulgaria, bt 3-Roger Federer, Switzerland, 3-6, 6-4, 3-6, 6-4, 6-2

5-Daniil Medvedev, Russia, bt 23-Stan Wawrinka, Switzerland, 7-6 (6), 6-3, 3-6, 6-1

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