CERTAINLY the most difficult attribute to measure, but both men are clearly mentally strong individuals having fought at the top level. However, yet again, Mayweather holds a considerable advantage.

His superhuman self-confidence makes defeat an impossibility for him, while Berto will always have lingering doubts over his chances, having thrice been bested.

Mayweather is also a master of mind games and has even hinted that Berto has been spied on while training, which could play on the mind of the challenger.

Advantage: Mayweather

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