
4. Jack Dempsey vs. Luis Firpo
The oldest fight on this list was unbelievably insane. 90,000 were in attendance at the Polo Grounds with another 25,000 standing outside. Dempsey stormed in but Firpo stunned everybody watching by dropping him with a right hand. Things just got crazier from then on.

Dempsey came back, knocking Firpo down a ridiculous seven times. This was a different era. Then Firpo sent Dempsey crashing through the ropes. Finally, Dempsey came back in with a massive cut and dominated the challenger until he got the finish.