Andre Berto believes he can spring a surprise by becoming the first man to defeat Floyd Mayweather

Andre Berto says he is a man "on a mission" as he bids to end Floyd Mayweather's perfect record.

The 31-year-old (30-3-KO23) takes on his fellow American at the MGM Grand Garden Arena on September 12, in what Mayweather has said will be the final fight of his illustrious 19-year professional career.

If Mayweather (48-0-KO26)overcomes Berto in Las Vegas, he will equal boxing legend and former heavyweight world champion Rocky Marciano's record of 49-0. But Berto insists he has the ability to cause the undefeated Mayweather problems and claims he has never been fitter heading into the fight.

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