Federer fitness key to Davis Cup final

Roger Federer is set to defy crippling back pain and a questionable relationship with Swiss teammate Stan Wawrinka when he plays his first ever Davis Cup final against France in Lille from Friday.
The Swiss have never won the Davis Cup in its long history, while France have won the team trophy nine times, the last coming away to Australia in 2001.
Federer is a 17-time Grand Slam winner and currently ranked second in the world, while this year's Australian Open champion Wawrinka is ranked fourth.
Logically they are the hot favourites -- but a dramatic weekend in London at the season-ending ATP World Tour Finals has changed the picture.

That was due to a remarkable semi-final that pitted the two Swiss players against each other and which Federer won after saving four match points in a gruelling blockbuster that lasted just short of three hours.
The duel left both players bruised and battered.

Wawrinka was distraught at letting slip such a golden opportunity to better, for once, his more illustrious countryman.
Federer was left in such pain from back spasms that he was forced to forfeit the next day the tournament final against Novak Djokovic.
If that was not damaging enough, the two Swiss stars found themselves embroiled in an ugly spat over an incident late in the third set of their match when Wawrinka complained about noises coming from Federer's courtside box, with his wife Mirka being the culprit.

By all accounts the two had a long and tense set-to in the locker-room afterwards and they made their own separate ways to Lille on Monday.
Since then the Swiss players have been at pains to play down the incident appearing at a press conference during which they laughed and traded jokes and jibes.
More worryingly for the Swiss though has been the state of Federer's back -- an injury which has increasingly nagged him in the later years of his career.
He was unable to practice on the red claycourt that has been painstakingly laid down inside one half of the Stade Pierre Mauroy football stadium outside Lille, until a brief 30 minutes outing on Wednesday evening.