Floyd Mayweather Jr BiographyFloyd Mayweather Jr., born February 24, 1977 in Grand Rapids, MI, USA. Mayweather, who was born with the name Floyd George Sinclair, is a professional boxer who has a record of 38-0 (24 KOs).Since July 18, 2005, he has been 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