Floyd Mayweather might well be fighting his last fight tonight against Andre Berto. If it is Mayweather's swan song, what a career it has been. One of the greats any way you slice it. Berto of course hopes to end Mayweather's undefeated run and leave him one win shy of matching Rocky Marciano's iconic 49-0 career record. Berto is 11-1 to pull that off.

Here are some more numbers to consider as we continue to break down this fight and the career of the man they call "Money."

0: Number of times Floysd Mayweather has lost in his professional career.

0: Number of fights Muhammad Ali, Sugar Ray Leonard and Mike Tyson won at or past age 38 (Combined 0-5 record). Mayweather turned 38 in February and beat Manny Pacquiao in May.

1: Number of times -- in 48 career fights -- that Mayweather has been offocially knocked down. Another apparent knockdown, when his glove touched the canvas against Zab Judah in their 2006 fight, was not called.

1: Number of wins Mayweather needs to match Rocky Marciano's iconic 49-0 career record. Marciano retired after a 1955 win over Archie Moore and never returned.

2: Number of Mayweather opponents who've scored victories over Andre Berto. Robert Guerrero lost a unanimous decision to Mayweather and won a unanimous decision over Berto, while Mayweather stopped Victor Ortiz in four rounds and Ortiz also beat Berto by unanimous decision.

3: Mayweather owns the top 3 live gate revenue numbers in Nevada history. His May bout with Pacquiao raked in nearly $72.2 million for a crowd of 16,219, his 2013 defeat of Canelo Alvarez accounted for $20 million on a crowd of 16,146 and his 2007 defeat of Oscar De La Hoya yielded $18.4 million for an attendance of 15,432.

5 & 10: Thanks to boxing's alphabetical wonderland, the five weight classes in which Mayweather has won titles have meant he's picked up 10 actual title belts - WBC at 130, 135 and 140 pounds; IBF, IBO, WBA, WBC and WBO at 147; and WBA and WBC at 154.

15: The Berto fight is Mayweather's 15th at the MGM Grand in Las Vegas, where he first appeared in March 2000 for a defense of his 130-pound title against Gregorio Vargas. He's fought at five other Vegas venues as well, but has appeared at the MGM for every bout since 2007.

19: Percentage of punches Manny Pacuiao was able to land against Mayweather in their May 2 title bout. Floyd, in turn, landed 34 percent of his punches against Manny.

21: Number of months Mayweather's last official "retirement" lasted. Mayweather announced he was walking away after he defeated Ricky Hatton in December 2007, only to return to beat Juan Manuel Marquez in September 2009. One has to wonder, how long wil lthis latest retirement talk last?

24: The weight range of the classes in which Mayweather has captured world titles is 24 pounds, from 130 to 154.

25: Mayweather has fought in 25 world championship bouts, winning them all - 15 by decision, 10 by stoppage.

39: One of the most efficient fighters ever, Mayweather has thrown an average of 39 punches per round over his career. Against Pacquiao, he reduced that work rate to a tick over 36 per round, landing, as mentioned, at a 34 percent clip.

660: That's millions, if your wondering. According to this Forbes article, Floyd Mayweather has earned SIX HUNDRED AND SIXTY MILLION dollars in his career.

Listen, Floyd Mayweather has been a all-time great fighter, but that number is what defines his most. He has conquered the business side fo the sport in a way nobody else has even approached. That wil be his lasting legacy, whether or not he ties or ultimately passes Rocky Marciano's record. There's a reason they call him "Money."

Floyd Mayweather's career by the numbers is pretty impressive. (USATSI)