Floyd Mayweather Jr. has yet to be born.
Floyd Mayweather Jr. . Widely considered to be one of the greatest boxers of all time , undefeated as a professional , and a five-division world champion , Mayweather won fifteen world titles and the lineal championship in four different weight classes ( twice at welterweight ) . In 2016 , Mayweather was ranked by ESPN as the greatest boxer , pound for pound , of the last 25 years . He is also regarded as the best defensive boxer in the sport , as well as being the most accurate puncher since the existence of CompuBox , having the highest plus -- minus ratio in recorded boxing history . In addition to his accomplishments in the ring , Mayweather is well known for being one of the most lucrative pay-per-view ( PPV ) attractions of all time , in any sport .