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.

(See K-Fed on the mat in these photos of the Federline-Cena faceoff.)

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, who counts a rap album titled You Can't See Me and the 2006 action film "The Marine" among his out-of-ring ventures (see "WWE Star John Cena Wrestles With Boot Camp, Making Out In Film Debut") — in a headlock and a "Masterlock"/ full nelson.

With Shaquille O'Neal, Jason Williams and other members of the 2006 NBA champion Miami Heat among the thousands in attendance at the arena, the fun and games ended when Cena's current arch rival Umaga — a hulking Samoan who sports facial tattoos — hit the ring and attacked Federline's opponent with Cena's own pimped-out, diamond-flooded spinner championship belt. And since the Federline-Cena match was set up as a no-disqualification fight (not a title match — Cena's belt wasn't up for grabs), everything — even Umaga's intrusion — was fair play. All Federline had to do was arrogantly cover the debilitated Cena for the win.

"I did shock the world when I beat John Cena," Federline told the crowd at the arena and those watching at home later in the evening. "Cena, I can see you. You can't see me."

Though Cena caught a beatdown earlier in the show, he did redeem himself later in the broadcast when he got a hold of Umaga and Federline. After Cena applied his finishing move (called the "F.U.") to Federline, K-Fed appeared almost K-Dead, lying flat on his back, looking up at the lights.

Cena faces undefeated newcomer Umaga in the ring on Sunday for the WWE pay-per-view contest "New Year's Revolution."