<Tr> <Th_colspan="3"> Olympic Games </Th> </Tr> <Tr> <Td> </Td> <Td> 1996 Atlanta </Td> <Td> Featherweight </Td> </Tr> <P> Floyd Joy Mayweather Jr. (born Floyd Joy Sinclair; February 24, 1977) is an American professional boxing promoter and former professional boxer . He competed from 1996 to 2007 and 2009 to 2015, and made a one - fight comeback in 2017 . During his career, he held 15 world titles in five weight classes and the lineal championship in four different weight classes (twice at welterweight), and retired with an undefeated record of 50--0, surpassing Rocky Marciano's record of 49--0 . As an amateur, Mayweather won a bronze medal in the featherweight division at the 1996 Olympics, three U.S. Golden Gloves championships (at light flyweight, flyweight, and featherweight), and the U.S. national championship at featherweight . </P> <P> Mayweather is a two - time winner of The Ring magazine's Fighter of the Year award (1998 and 2007), a three - time winner of the Boxing Writers Association of America Fighter of the Year award (2007, 2013, and 2015), and a six - time winner of the Best Fighter ESPY Award (2007--2010, 2012--2014). In 2016, Mayweather was ranked by ESPN as the greatest boxer, pound for pound, of the last 25 years . In the same year, he peaked as BoxRec's number one fighter of all time, pound for pound, as well as the greatest welterweight of all time . Many sporting news and boxing websites, including The Ring, Sports Illustrated, ESPN, BoxRec, Fox Sports, and Yahoo! Sports, ranked Mayweather as the best pound for pound boxer in the world twice in a span of ten years . </P>

Who has the best boxing record of all times