The raw data behind: "Mayweather Is Defined By The Zero Next To His Name" https://fivethirtyeight.com/features/mayweather-is-defined-by-the-zero-next-to-his-name/

undefeated

Format

A data frame with 2125 rows representing boxing matches and 4 variables:

name

Name of boxer

url

URL with the boxer's record

date

Date of the match

wins

Number of cumulative wins for the boxer including the match at the specified date

Source

Box Rec http://boxrec.com/