Lille, France: Roger Federer, whose back injury has cast serious doubts over his Davis Cup final spot, practiced for the first time on Wednesday in a timely boost for the Swiss team ahead of their showdown against France. (Federer's Back Key in Davis Cup Final)
The 17-time major winner, who has never won the Davis Cup, injured his back playing in the semi-finals of the World Tour Finals in London on Saturday and had not hit a ball until Wednesday. (Federer Pulls Out of World Tour Final)
He won the gruelling three-set marathon in London against Swiss team-mate Stan Wawrinka after saving four match points, but paid a hefty price for his efforts and was unable the following day to take on Novak Djokovic in the final.