Floyd Mayweather Jr.'s accomplishments dwarf that of his May 4 opponent, Robert Guerrero.
That is not surprising since Mayweather has compiled an impressive resume while earning his perfect 43-0 record.
Guerrero's record at 31-1-1 is actually not all that far off from Mayweather's. However, it lacks the same kind of pedigree and star power.
This will all become evident as we review the three biggest wins in the career of each fighter.
Robert Guerrero's Biggest Wins
3. Referee Technical Decision Over Eric Aiken in 2006
On Sept. 2, 2006, Eric Aiken did not get off his stool after the eighth round in his IBF featherweight title fight against Guerrero.
At the age of 23, and with a 19-1-1 record, this was Guerrero's first world championship.
Guerrero's eventual jump in weight is no surprise after looking back at this performance. He overpowered Aiken from start to finish.
2. Unanimous Decision Over Joel Casamayor in 2010
On July 31, 2010, Guerrero easily handled Joel Casamayor to improve to 27-1-1.
At that point in his career, Casamayor was 39 and showing every bit of it. Guerrero did not have to work all that hard for the victory, and the fight was boring as a result.
However, it was important for him to get a solid win in the jump in weight.
1. Unanimous Decision Over Andre Berto in 2012
Easily the biggest win of his career, on Nov. 24, 2012, Guerrero took a unanimous decision over Andre Berto.
This fight was a battle, but Guerrero was the superior fighter. He knocked down Berto twice and left him with a badly battered face.
The performance was solid in its workmanlike effort for Guerrero.
Floyd Mayweather's Biggest Wins
3. TKO over Diego Corrales in 2001
Fighting for the WBC super featherweight title on Jan. 20, 2001, Floyd Mayweather battled the undefeated Diego Corrales (33-0 with 27 knockouts).
With a string of victories that included Robert Garcia, John Brown and Derrick Gainer, Corrales wasn't facing a light schedule. He looked like a strong opponent for Mayweather. He was not.
Mayweather was way too much. He couldn't be hit and his counter punching was brilliant. After this fight, Mayweather began earning serious consideration for the best pound-for-pound title.
2. TKO over Genaro Hernandez in 1998
Fighting for the WBC super featherweight title, Oct. 3, 1998, this was the fight that really should have put Mayweather in the discussion for the best.
Genaro Hernandez was a skilled champion, but he was destroyed by Money. Floyd couldn't be hit, and he was deadly with his counter punches.
This is arguably the closest Mayweather has come to perfection in the ring.
1. Split-Decision Victory Over Oscar De La Hoya in 2007
This much-hyped fight turned out to be better than many anticipated. Money was left a little battered after a grueling fight with the legendary Oscar De La Hoya for the WBC super welterweight title.
While on the day of this fight, May 5, 2007, Mayweather was widely seen as the better fighter, De La Hoya was the biggest draw.
The box office for this bout set records, and Money emerged from this massive event as the sport's new cash cow.