Floyd Joy Mayweather, Jr. (born Floyd Joy Sinclair on February 24, 1977), is an undefeated American professional boxer who has a record of 39-0 (25 KOs). He is the son of Floyd Mayweather, Sr., a former welterweight boxing contender.
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.