Andy Murray has revealed he might skip the ATP World Tour Finals for the sake of Great Britain's Davis Cup chances.
Murray beat Australia's Bernard Tomic in straight sets on Sunday to seal Britain's first spot in the final since 1978, where they will take on Belgium at the end of November.
The Belgian team are likely to opt for a clay surface at the Flanders Expo Arena in Ghent and the tie is scheduled to take place just five days after the World Tour Finals, which are played on hard courts at London's O2 Arena, making life tricky for Murray.
"The O2 would obviously be a question mark for me if we were playing [the Davis Cup final] on clay," Murray told BBC Sport. "I would go and train and prepare on the clay to get ready for the final."
Citing last year's Tour Finals, where Roger Federer pulled out of the final after waking up with a sore back and unable to play, the British No.1 added: "You saw last year that the matches at the O2 are extremely tough and physically demanding.
"If you reach the final and play on the Sunday you also need to take time off - you can't just play five matches against the best players in the world and then not take any days off.
"For me to play -- if I was to reach the final -- five in a row and then take a couple of days off, it would mean only playing for two days on the clay before the Davis Cup final starts and that wouldn't be enough for me.
"I need more time on the clay to let my back get used to it."
Murray played two singles matches and paired up with brother Jamie in the Davis Cup semifinals against Australia, winning all three, and admitted it would be "incredible" to go on and lift the title which Great Britain haven't won since their ninth and final time back in 1936.
If Murray opts out of the Tour Finals, which take place 15-22 November, he will miss out on between £300,000 and £1.25 million in prize money, as well as 1,500 ATP ranking points and the chance to win the season-ending showdown for the first time.