I think there's lots of guys could kick floyd mayweather's @$$ in a street-fight.

Mayweather's style is the ultimate exploitation of Boxing rules which results in a style that can win a boxing match on points in a boxing ring, but is non-functional elsewhere. If Mayweather struck a man bare-fisted in the street, he'd break his fragile hands without doing any serious damage to his adversary.

Boxing was once "The Noble Art of Self-Defense", and that real-world application as self-defense is how I view Boxing, not at all as a sport/game that is becoming the popular assessment of it ie Olympic Boxing.

With that touch-for-points amateur system, plenty of developing fighters develop bad habits and never learn how to throw a real punch with their body-weight behind it (Paulie Malignaggi, Paul Williams, Winky Wright, Joe Calzaghe, Floyd Mayweather, Cory Spinks, Chris Byrd)

Where in the hell but in a Boxing ring would Muhammad Ali's rope-a-dope strategy have any hand-to-hand combat value at all?

James Toney, Glengoffe Johnson, Edison Pantera Miranda, Arthur Abraham, Ricardo Mayorga, Edwin Valero, Antonio Margarito, Miguel Cotto, Zab Judah are some guys that would f*<k you up in a street-fight though.