Weight: 213 lbs, Age: 24
Record: 26-0-0
Result: Knocked out Cleveland Williams in Round 3
Punchcount: Ali 55, Williams 11
Why: If you watch Ali in this fight, you see blazing speed, combination punching, perfect ring generalship, extremely elusive defense and even good punching power, flooring Williams (who was 65-5-1 at the time) 4 times. He completely dominated a quality fighter.
2. George Foreman-----January 22, 1973
Weight: 217 lbs, Age: 24
Record: 37-0-0
Result: Knocked out Joe Frazier in Round 2
Punchcount: Foreman 38, Frazier 11
Why: Foreman was quick, focused and strong. His power punches completely devestated Frazier, who was the undefeated champion at the time. Foreman knocked Frazier down 6 times and seized the Heavyweight Title in spectacular fashion.
3. Joe Louis------June 22, 1938
Weight: 199, Age: 24
Record: 35-1-0
Result: Knocked out Max Schmeling in Round 1
Punchcount: Louis 23, Schmeling 2
Why: Louis avenged his only defeat in extraordinary fashion, completely crushing former champion Schmeling. Louis landed everything he wanted to in a spectacular display of skillful power punching.
4. Mike Tyson--------June 27, 1988
Weight: 218, Age: 21
Record: 34-0-0
Result: Knocked out Michael Spinks in Round 1
Punchcount: Tyson 10, MSpinks 0
Why: Tyson was so fast and so powerful that the undefeated champion Spinks was actually afraid of him. Tyson hit him so hard that he essentially quit. Spinks was floored twice in only 91 seconds as Tyson unleashed hooks, rights and body shots.
5. Joe Frazier---------March 8, 1971
Weight: 205, Age: 27
Record: 26-0-0
Result: Beat Muhammad Ali by 15 round Decision
Punchcount: Frazier 185, Ali 167
Why: Frazier was probably as prepared for this fight as any heavyweight ever was. He was so determined to beat Ali, and it showed. Frazier unleashed power shots and a vicious body attack that was so constant and so severe that Ali simply couldn't overcome it. He capped off this tremendous performance with a 15th round knockdown.