Federer, of Switzerland, will take on France’s Gael Monfils in the second singles match.
Federer injured his back last week during his win over Australian Open champion Stan Wawrinka in the semifinals at the ATP finals. He withdrew from the final against Novak Djokovic because of the injury.
"I'm just pleased that I can play tomorrow, give it a go. Things have been going well,” Federer said, according to the BBC. The 17-time Grand Slam champion trained on Thursday and decided to play following Thursday's early practice session.
Monfils and Federer met at this summer's U.S. Open, with Federer coming back from a two-set deficit and fighting off two match points to win 4-6, 3-6, 6-4, 7-5, 6-2.
Wawrinka (Switzerland) will take on Jo-Wilfried Tsonga (France) in the opening singles match on Friday.
Federer, the ATP No. 2 player in the world, will face Tsonga in the reverse singles with Wawrinka playing Monfils in a fifth match on Sunday.
Switzerland has never won the Davis Cup.
- Scooby Axson