Floyd Mayweather Jr. (50-0, 27 KOs) officially retired from professional boxing with an unblemished record. No professional fighter has defeated him in a sanctioned bout.
Professional Record: Undefeated
Mayweather competed professionally from 1996 to 2017, winning 15 major world titles across five weight divisions (Super Featherweight, Lightweight, Light Welterweight, Welterweight, Light Middleweight). His 50-0 record surpassed Rocky Marciano's 49-0.
Amateur Career: Losses Occurred
While unbeaten as a pro, Mayweather experienced losses during his extensive amateur career:
- 1993 National Golden Gloves Quarterfinal: Lost a decision to Augie Sanchez (disputed).
- 1996 Olympic Featherweight Semifinal: Lost a highly controversial 10-9 decision to Bulgaria's Serafim Todorov at the Atlanta Games. This contentious loss denied Mayweather an Olympic gold medal opportunity. Many observers believed Mayweather clearly won the bout.
- Other Amateur Losses: Mayweather is also credited with other amateur defeats earlier in his career (e.g., losses to fighters like Carlos Navarro and Martin Castillo before the '96 Olympics). His overall amateur record is approximately 84-8.
Notable Professional Fights
- vs. José Luis Castillo I (2002): Won a controversial unanimous decision. Mayweather later dominated the immediate rematch.
- vs. Arturo Gatti (2005): Dominated and stopped the popular champion in 6 rounds.
- vs. Oscar De La Hoya (2007): Won a split decision for the WBC Light Middleweight title, marking a major PPV milestone.
- vs. Ricky Hatton (2007): Stopped the undefeated British star in 10 rounds.
- vs. Manny Pacquiao (2015): Won a decisive unanimous decision in the long-awaited "Fight of the Century".
- vs. Conor McGregor (2017): Stopped the MMA star in the 10th round in his final professional bout, solidifying the 50-0 record.
Disqualification Note
Mayweather was controversially disqualified in a 1998 pro fight against Carlos Rios for hitting after the bell. However, this is recorded as a win via Disqualification (DQ) for Mayweather, as the foul was committed by Rios's corner entering the ring. It is not counted as a loss.
In conclusion, Floyd Mayweather Jr.'s professional boxing record remains universally recognized as perfect: 50 wins, 0 defeats. Losses occurred only in his amateur career.
