Greg Rusedski insists Roger Federer is favourite to win the ATP World Tour Finals which begin in London on Sunday, but believes both Rafa Nadal and Andy Murray will push the Swiss hard.

ATP World Tour Finals
Venue: O2 Arena, London Dates: 21-28 November
Coverage: One match each day live on BBC TV, streamed online & available through iPlayer; text commentary online and on mobiles for every singles match via BBC Sport website; every singles match live on 5live sports extra.