Former Heavyweight Boxing Champion Mike Tyson breaks down the current state of MMA and compares it to the "sweet science." UFC Welterweight Champion Georges St. Pierre is successful, he argues, because "Rush" doesn't want to be a rap star.

Floyd Mayweather Jr. vs. Robert Guerrero weigh in results live online stream and video today (May 3) for 147-pound bout at MGM Grand in Las Vegas, Nevada, tomorrow night. Check out live video feed of scale tipping Showtime action right here.

Latest Mayweather vs Guerrero fight odds, betting lines and online prop bets for the championship boxing fight between Floyd Mayweather Jr. and Robert Guerrero, which takes place on May 4, 2013 at the MGM Grand Garden Arena in Las Vegas, Nevada.

Ahead of his Floyd Mayweather fight this Saturday night (May 4, 2013) at the MGM Grand Garden Arena in Las Vegas, Nevada, top pound-for-pound pugilist Robert Guerrero gave some love to the skills of UFC Heavyweight Champion Cain Velasquez.

Who will win? Floyd Mayweather Jr. vs. Robert Guerrero full fight prediction and preview online for WBC Welterweight boxing title fight that will air on Showtime pay-per-view (PPV) on May 4, 2013, from MGM Grand Garden Arena in Las Vegas, Nevada.

UFC President Dana White lays down the gauntlet to boxer Tyson Fury, saying the champion is more than welcome to step inside the Octagon to face UFC heavyweight kingpin Cain Velasquez. A fight White says would end with Fury getting "smashed."

Here are the highlights from the thrilling Canelo Alvarez vs. Austin Trout super welterweight championship showdown that took place tonight (Sat., April 20, 2013) at the Alamodome in San Antonio, Texas.