US Open: Roger Federer beats Gael Monfils in five-set thriller

Roger Federer saved two match points as he beat Gael Monfils to keep alive his hopes of an 18th Grand Slam title at the US Open.
The Swiss won 4-6 3-6 6-4 7-5 6-2 in a dramatic New York night session to reach the semi-finals.
Federer, 33, goes on to face Croatia's Marin Cilic in the last four on Saturday.

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