Which boxer handed Floyd Mayweather Jr. his only Olympic defeat in 1996?

Serafim Todorov handed Floyd Mayweather Jr. his only Olympic defeat in the 1996 Atlanta Games.

The Bulgarian boxer defeated the 19-year-old American by a 10–9 decision in their featherweight semifinal on August 2, 1996. The result sent Todorov into the gold-medal bout and left Mayweather with a bronze medal after he had advanced through the earlier rounds.

The decision remains one of the most debated moments in Olympic boxing. Many observers, including members of the American team, believed Mayweather had done enough to win. The United States filed a protest, but it was rejected, and the official result stood. Todorov eventually lost the final to Thailand’s Somluck Kamsing and took silver.

Mayweather turned professional soon afterward and built an unbeaten career, so Todorov remained the last boxer to defeat him in an officially recorded bout. That distinction is why the Olympic semifinal is often mentioned whenever Mayweather’s career is discussed.