Despite a speedy recovery from a back injury to make it back for the Davis Cup final,
looked a shadow of himself in a straight-sets loss to
on Friday as France leveled the tie at 1-1 on Friday.
Monfils triumphed 6-1, 6-4, 6-3 and posted his first win on clay over the 17-time Grand Slam champion, who decided to play despite the injury that forced him to pull out of the title match at the
Finals last Sunday.
Federer had only two short training sessions earlier this week and looked out of sorts while Monfils hit 44 winners including 10 aces. The Swiss, who is chasing a maiden win in the team competition, dropped his serve five times and could not convert the two break points he earned.
It was a stark contrast to Federer's superb display in London last week, where he eased past opponents but hurt his back during his semifinal victory over Davis Cup teammate Stan Wawrinka.
Monfils sealed his win in less than two hours on his first match point with a backhand down the line, getting a measure of revenge after his tough loss to the Swiss in the quarterfinals at the
in September, when the Frenchman lost in five sets after going up two sets to one and failing to convert two match points.
Earlier, Wawrinka had put the Swiss ahead by beating
, 6-1, 3-6, 6-3, 6-2.
The doubles on Saturday are set to pit French pair