Federer beat Del Potro to Clash with Nadal in Semis of World Tour Finals

Federer rejoices his victory over Del Potro Saturday at O2 Arena

In a sensational match at the London's O2 stadium's centre court, Roger Federer beat Juan Martin Del Potro in a three set match to set up a semi-final clash with Rafael Nadal at the World Tour Finals.

Federer having lost the first set 4-6 to the Argentinian, won the next two sets 7-6 (7-2) 7-5 and will face world number one Nadal in the semis of the ATP World Tour Finals on Sunday.

The match was witnessed by a capacity crowd - and most of these were Swiss fans of Federer who cheered every time Federer won a point and waved Swiss flags.

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