Federer through to semis at ATP Finals

Eight-time Dubai Duty Free Tennis Championships winner Roger Federer is through to the semi-finals of the ATP Finals. 

He beat Novak Djokovic in a pulsating round-robin encounter at the O2 Arena in London on Thursday night.

The 6-4, 6-3 win means that the Serb is now eliminated from the season-ending tournament. 

It also means that Rafael Nadal will finish the year as the top-ranked male tennis player in the world.

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