Former five-division champion Floyd Mayweather Jr. is fighting WBC welterweight champion Victor Ortiz on Saturday at the MGM Grand Garden Arena in Las Vegas.

The 34-year-old Mayweather (41-0, 25 KOs) is widely regarded as one of the two best pound-for-pound fighters in the world (along with fellow 147-pounder Manny Pacquiao). The 24-year-old Ortiz (29-2-2, 22 K0s) is lesser-known among casual fans, but considered one of the sport's hottest fighters after outpointing Andre Berto for the welterweight title in a Fight of the Year candidate on Apr. 16.

Ortiz has just one win over a world-class opponent in his prime: his unanimous-decision win over Berto for the welterweight title. But he has enough quick knockouts over recognizable names -- Vivian Harris (KO 3), Mike Arnaoutis (TKO 2), Jeffrey Resto (KO 2) -- to show he's more than a carefully matched prospect. Perhaps the biggest trial of Ortiz's career came when he quit during the sixth round of a 2009 slugfest with Marcos Maidana, opening himself to harsh criticism and questions about his constitution. Not until the Berto fight, where he showed tremedous courage by twice coming off the canvas to win, did Ortiz fully redeem himself.

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 With six world titles in five divisions ranging from junior lightweight to super welterweight, Mayweather is one of the most accomplished boxers of his generation. But it's been 16 months since his last outing, and he's fought a total of 24 rounds since a 2007 knockout of Ricky Hatton. He's been far more active in the legal arena, where pending litagation against him includes four felony charges, two misdemeanors and a defamation suit. For years Mayweather has embraced the villain role. He knows people pay to see him lose. "They're all fans," he says. "They all pay." And how: Mayweather has generated 6.9 million buys in his seven pay-per-view fights, representing $375 million in revenue. Those numbers mean at least as much as 41-0 with 25 knockouts.

 Last Five Fights Mayweather Ortiz 5/1/10 Shane Mosley W UD 12 4/16/11 Andre Berto W UD 12 9/19/10 Juan M. Marquez W UD 12 12/11/10 Lamont Peterson D MD 10 12/8/07 Ricky Hatton W TKO 10 9/18/10 Vivian Harris W KO 3 5/5/07 Oscar De La Hoya W SD 12 5/15/10 Nate Campbell W UD 10 11/4/06 Carlos Baldomir W UD 12 2/25/10 Hector Alatorre W TK0.