In a boxing match ali is way too big for little bruce he would probably get hurt. In a street fight it would take bruce awhile but i think he would eventually kung fu his ass.

Any one that says little bruce doesnt know his shit and just made movies doesnt know their shit!
He was a great martial artist and would have been a champion in the ufc.

Back then movies was the only way he could get noticed so thats what he did a long with write his own style of martial arts that was proven to be affective in street fighting. He would have made a good boxer too with his lightning speed and excellent foot work. He knew how to put all of his weight behind everything he threw.

Bruce has nothing on me though