Reuters

Federer beats Ferrer again to reach semi-finals

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Switzerland's Roger Federer celebrates defeating Spain's David Ferrer in his men's singles tennis match at the World Tour Finals in the O2 Arena in London November 8, 2012. REUTERS/Kieran Doherty

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Switzerland's Roger Federer returns a shot during his men's singles tennis match against Spain's David Ferrer at the World Tour Finals in the O2 Arena in London November 8, 2012. REUTERS/Kieran Doherty

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Spain's David Ferrer returns a shot during his men's singles tennis match against Switzerland's Roger Federer at the World Tour Finals in the O2 Arena in London November 8, 2012. REUTERS/Kieran Doherty

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Spain's David Ferrer returns a shot during his men's singles tennis match against Switzerland's Roger Federer at the World Tour Finals in the O2 Arena in London November 8, 2012. REUTERS/Kieran Doherty

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