5. Floyd Mayweather Jr., Boxing
He may not have the physical intimidation that some of the other guys on this list have, but seeing how he’s undefeated in his professional career with a 45-0 mark, we’d bet there aren’t too many fighters who are lining up to face-off against “Money” in the ring. Given that he’s just about as brash and confident as any athlete ever, Mayweather not only plays with his opponents’ heads prior to a fight, but then delivers when he’s hitting them across the face with a nasty hook or jab, too.
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