The Fed loses at US Open

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Roger Federer suffered a stunning upset in the fourth round of the US Open, the 17-time Grand Slam champion falling to Spanish 19th seed Tommy Robredo 7-6 .. 6-3 .. 6-4 in a last-16 match on Monday. 

Federer's failure came on the heels of a shock second-round Wimbledon exit and thwarted a potential quarter-final showdown with 12-time Grand Slam winner Rafael Nadal, what would have been their first duel on the New York hardcourts.

Meanwhile, world number two Nadal move into the US Open quarter-finals with a 6-7 .. 6-4 .. 6-3 .. 6-1 win over German 22nd seed Philipp Kohlschreiber.

He will face Robredo in the next round.