Floyd Joy Mayweather, Jr. is a former American professional boxer who has a record of 39-0 (25 KOs). He was born Floyd Joy Sinclair in Grand Rapids, Michigan, with his mother's last name. His last name would change to Mayweather shortly thereafter. His father, Floyd Mayweather Sr., is a former welterweight contender. One of his uncles, Jeff Mayweather, is a former IBO super featherweight champion. Another uncle, former two-division world champion Roger Mayweather, is Mayweather, Jr.'s current trainer. Floyd attended Grand Rapids Ottawa Hills High School.

From July 18, 2005 through June 2, 2008 he was rated by The Ring magazine as the number-one pound for pound boxer in the world. Mayweather has won six world boxing championships in five different weight classes; he is the former WBC welterweight champion, a title he vacated upon his retirement. He was named Ring Magazine Fighter of the Year in 1998 and 2007. ESPN.com listed Mayweather at #48 on their "50 Greatest Boxers of All Time" list.

Mayweather was also well known for competing on the fifth season of Dancing with the Stars where he was the fourth celebrity eliminated from the competition.