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 ) . As an amateur , he won a bronze medal in the featherweight division at the 1996 Olympics . In 2016 , Mayweather was ranked by ESPN as the greatest boxer , pound for pound , of the last 25 years .