Floyd Mayweather Jr. was a professional fighter.
BoxRec or boxrec.com is a website dedicated to holding updated records of professional boxers , both male and female . Floyd Mayweather Jr. . 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 . Pound for pound is a term used in combat sports such as boxing or mixed martial arts to reflect an assessment as to who the better fighters are , regardless of size ( i.e. , regardless of weight class ) . Welterweight is a weight class in combat sports .