Just thought of a good one. Floyd Patterson, he got decked 7 times in one round by Johansson then came back and beat the guy twice, then he got demolished twice by Liston and came back to get wins against good fighters such as George Chuvalo, Henry Cooper and Oscar Bonavena. Got a draw with Quarry and went the distance with Jimmy Ellis in his second attempt to become the first 3 time HW champ of the world after he lost his first attempt to Ali. Shame he never managed in one way I suppose.