Based on the provided reference, several boxers never lost a fight, retiring with undefeated records. These include Rocky Marciano, Terry Marsh, and Floyd Mayweather Jr.
The provided reference, titled "List of undefeated world boxing champions", highlights notable male boxers who concluded their professional careers without suffering a loss. While some finished with perfect records (no losses or draws), others retired with no losses but at least one draw.
According to the reference, the following boxers are listed with zero losses on their professional record:
| Boxer | Record | Weight Class |
|---|---|---|
| Rocky Marciano | 49–0–0 | Heavyweight |
| Terry Marsh | 26–0–1 | Light welterweight |
| Floyd Mayweather Jr. | 50–0–0 | Super featherweight, Lightweight, Welterweight, Light middleweight |
- Rocky Marciano: Finished his career with a perfect record of 49 wins and no losses or draws, all in the heavyweight division.
- Terry Marsh: Retired with a record of 26 wins, 0 losses, and 1 draw, primarily competing in the light welterweight division. While he didn't win every fight due to the draw, he never recorded a loss.
- Floyd Mayweather Jr.: Concluded his career with an unblemished record of 50 wins, 0 losses, and 0 draws across multiple weight classes. His record is the longest perfect streak for a male champion listed.
Therefore, based on the reference provided, Rocky Marciano, Terry Marsh, and Floyd Mayweather Jr. are boxers who never lost a professional fight.
