Rafael Nadal takes on Roger Federer next

Former world number ones Rafael Nadal and Roger Federer will meet next in Group A at the ATP World Tour Finals in London.

The pair played out last year's final at the competition, with Federer coming out on top to claim the title.

The other match in the group will see Frenchman Jo-Wilfried Tsonga face Mardy Fish.

World number eight Fish lost to Nadal this evening, while Tsonga suffered the same fate against Federer in the competition's opening match.

Both matches will be played on Tuesday.