Roger Federer ensured he would end the year as world number one after he beat Andy Murray 3-6 6-3 6-1 in a round-robin match at the ATP World Tour Finals on Tuesday.
The Swiss could have been usurped by Rafael Nadal but the Spaniard's defeat on Monday coupled with Federer's two victories in London meant he could no longer be overtaken this year.
Roger Federer ensured he would end the year as world number one after he beat Andy Murray 3-6 6-3 6-1 in a round-robin match at the ATP World Tour Finals on Tuesday.
