What do you do if you are one of the biggest losers in the world?  Join the World Wrestling Federation and kick-butt.  Kevin Federline may have been an undisputed loser on the Billboard albums chart and at the concert box office in 2006, but Britney Spears’ soon-to-be-ex-husband started off 2007 with a bottle of champagne and a cigar in the winner’s circle on Monday night, prevailing in his first official match as a wrestler.

In the opening contest of WWE’s “Monday Night Raw” program — which aired live from Miami’s American Airlines Arena — Federline pinned champ John Cena for a three count.

The backup-dancer-turned-wannabe-MC — who told the “Raw” audience a couple of weeks back that he no longer wants to be called K-Fed — showed few in-ring abilities in his 10 minutes of fight time. It was mostly posturing from Federline, but he did manage to get Cena — one of wrestling’s biggest names,  in a headlock and a “Masterlock”/ full nelson.