What boxer would you want t back you up in an alley fight.

Aside from the obvious in Tyson and Foreman, I think someone like Virchis would be a good choice. Great chin, farmer strength, there aren't many who would pick a fight with him in a bar.

 

Iron Mike

 

Amalgamation of ideas, unbeatable I believe:

Amir Khan to lull them into a false sense of security
Mike Tyson to bite their ears off
Marciano to elbow them in the face
Golota to punch them all in the nuts over and over
Larry Holmes to drop kick them all in the face while they are doubled over in pain due to the punches in the knackers
David Tue to hit them when they are down
Plus naked Valuev to run around naked making weird noises to lower the morale of the enemy.

F*cking victory!