Undefeated Floyd Mayweather will attempt to match Rocky Marciano’s record of 49 unanswered victories against Andre Berto on 12 September.

Former welterweight champion Berto has 30 wins and three losses before his bout with his fellow American.

If he wins, Mayweather’s record will equal that of legendary 1950s American heavyweight Boxer Marciano, who retired from the sport without suffering a professional defeat.

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