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.