Floyd Mayweather Jr. has 20 career boxing knockouts .
Mayweather finished his career with a record of 26 wins without a loss or draw in world title fights ( 5 by KO ) ; 23 wins ( 5 KOs ) in lineal title fights ; 24 wins ( 7 KOs ) against former or current world titlists ; 12 wins ( 3 KOs ) against former or current lineal champions , and 2 wins ( 1 KO ) against International Boxing Hall of Fame inductees .