Rocky Marciano, 49-0 (43 KO)
Floyd Mayweather Jr., 49-0 (26 KO)
Joe Calzaghe, 46-0 (32 KO)
Andre Ward, 32-0 (16 KO)
Terence Crawford, 31-0 (22 KO)
Tyson Fury, 25-0 (18 KO)
Who else is there?
Draws and No Contests are no good.
Floyd Mayweather Jr., 49-0 (26 KO)
Joe Calzaghe, 46-0 (32 KO)
Andre Ward, 32-0 (16 KO)
Terence Crawford, 31-0 (22 KO)
Tyson Fury, 25-0 (18 KO)
Who else is there?
Draws and No Contests are no good.
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