1. The Thrilla In Manila
This savage war is definitely the greatest heavyweight clash of them all. Ali fought Frazier for the second time in a battle that lasted for a brutal 14 rounds. Everything was at stake in this trilogy fight with the winner taking the bragging rights.
Ali started strong with his jab but then halfway through Frazier put in ferocious work to the body. Towards the end of the fight, Ali regained control, and eventually, the swelling around Frazier’s eye was too much. It definitely shortened both men’s careers. But as far as classic heavyweight fights go, this one was, is, and will be definitive.