Who is the only boxer to have defeated Floyd Mayweather Jr.?

Floyd Mayweather Jr. is known for his undefeated professional boxing record, having retired with a remarkable record of 50 wins and 0 losses. Thus, no boxer has officially defeated him in a professional boxing match.

However, there is one instance where Mayweather was declared the loser in a fight. On August 2, 1996, during the semifinals of the Atlanta Olympics, Mayweather competed against Serafim Todorov, representing Bulgaria, in the featherweight division.

The bout between Mayweather and Todorov was a highly contentious one. Many boxing experts and fans believed that Mayweather had outperformed Todorov during the match, but the judges controversially awarded the victory to Todorov by a 10-9 decision. This outcome was heavily criticized, with widespread claims of biased judging.

Todorov's victory over Mayweather in the Olympic semifinals denied Mayweather the opportunity to compete for a gold medal. However, it is essential to note that the Olympic match did not count as an official professional loss for Mayweather, as it was an amateur bout.

Mayweather turned professional after the Olympics and went on to have a storied career, winning world titles in multiple weight divisions and establishing himself as one of the greatest boxers of his era. Throughout his professional career, Mayweather faced numerous skilled opponents but emerged victorious in all of his fights, maintaining his undefeated record.

While Mayweather's unblemished professional record remains intact, his defeat in the controversial Olympic bout against Serafim Todorov is a footnote in his boxing journey. Nonetheless, Mayweather's dominance in the professional ranks and his exceptional defensive skills have solidified his reputation as one of the sport's all-time greats.