FBI files suggest the 1964 world title bout between Cassius Clay and Sonny Liston was not a fair fight and the Mafia may have been involved.
It's being billed as richest fight in history - it features the most highly paid sportsman in the world for the last three years
Mike Tyson has revealed that he is on the verge of dying from alcohol and drug abuse after years of lying about being sober.
Justin Bieber is among a host of celebrities including Hollywood A-lister Jack Nicholson attending the Floyd Mayweather fight against Mexico's Saul Alvarez, which could be the biggest grossing bout yet.
Olympic gold medallist and European heavyweight boxing champion Audley Harrison has tweeted that celebrities have flocked to watch America's Floyd Mayweather take on Mexico's Saul Alvarez in Las Vegas.
This fight is going to be one hell of a fight. ...looking at the celebs in attendance, you can safely say boxing is NOT on life support
American boxer Floyd Mayweather has taken to Twitter ahead of what could be the biggest grossing fight yet, as he takes on Mexico's Saul Alvarez in Las Vegas.
Without GOD -- none of this is possible. Thank you for your love and support. http://t.co/okOp5VIToG
Former undisputed heavyweight world champion Lennox Lewis, US TV personality Larry King and singer Samantha Mumba are among a host of celebrities taking to social media to catch what could be the biggest grossing fight yet, between boxer Floyd Mayweather and Mexico's Saul Alvarez.
Mayweather doesn't overlook opponents.. I'm sure he's relaxed and ready to go when the time comes. #TheOne
Mayweather/Canelo fight party...leeggggggggoooo!!!Somebodies 0 has got to GO!;)
American business magnate Elon Musk has flown to see boxer Floyd Mayweather take on Mexico's Saul Alvarez, on a private jet with Justin Bieber, according to his Twitter.
Venture capitalist Shervin Pishevar also joined Musk and his ex-wife Talulah Riley and his brother Kimbal.
Boxing journalist Steve Bunce has told ITV News that "people have fallen in love" with Floyd Mayweather and he believes that the American will be backed to the hilt when he takes on Mexico's Saul Alvarez in Las Vegas on Saturday night.
The WBA light middleweight title fight is being billed as the richest in history.
Alvarez has quickly emerged as arguably Mexico's biggest boxing star.
Despite his powerful body attack and reputation for being a solid, hard-hitter, he is the 11/5 underdog against Mayweather.
Tale of the Tape:
Age: 23, born July 18, 1990.
Birthplace: Jalisco, Mexico, where he still lives.
Record: 42-0-1 (30 KO).
Height: 5ft 9ins.
Weight: (not official weigh-in) 152.
Mayweather re-established his position at the top of the game last May with a unanimous decision win over Robert Guerrero. He has been world champion at 130, 135, 140, 147 and 154 pounds, and is 5/14 favourite to win against Alvarez.
Tale of the tape:
Age: 36, born February 24, 1977.
Birthplace: Grand Rapids, Michigan, USA. Now lives Las Vegas, Nevada.
Record: 44-0 (26 KO).
Height: 5ft 8ins.
Weight: (not official weigh-in): 152 pounds.
Reach: 72 ins.
Saturday's bout and its billing as the richest fight in history will see Floyd Mayweather attempt to unify his WBA light middleweight title against WBC 154-pound champion Saul 'Canelo' Alvarez at the MGM Grand Garden Arena in Las Vegas.
Pound for pound number one at 36, Mayweather is back in the ring for the second time in five months.
Canelo turned pro at 15 and wins with a hard-hitting style and a powerful body attack.
Alvarez signed with Golden Boy Promotions in 2010, and his impressive unbeaten record of 42, no losses and one draw rivals that of Mayweather on 44 wins, no losses and 26 Knock Outs.