Here are boxing's most brutal knockouts in the sports history as compiled by the legendary Bert Sugar:
1. Rocky Marciano over Jersey Joe Walcott Round 13
2. Mike Weaver over John Tate Round 15
3. Bob Foster over Dick Tiger Round 4
4. Gerry Cooney over Ken Norton Round 1
5. Joe Louis over Max Schmelling Round 1
6. Jack Johnson over Stanly Ketchel Round 12
7. Sugar Ray Robinson over Gene Fullmer Round 5
8. Ray Mercer over Tommy Morrision Round 5
9. Jake LaMotta over Laurent Dauthuille Round 15
10. Jack Dempsy over Jack Sharkey Round 7
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