Sue Barker presents live coverage of the final between Rafael Nadal and Novak Djokovic at the ATP World Tour Finals in London.
The world's top two players will play each other for the sixth time this year and the 39th time in their careers. Nadal leads the personal duel 22-16 and has won three of their five matches this year, but Djokovic prevailed last time out in Beijing and is on an unbeaten run of 21 matches.
The Serb is also the defending champion and has won nine successive matches at the O2 Arena, while Nadal has never won the season-ending title.
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