Too Many Rounds

Mike Tyson has joined a long line of heavyweight champions who refused to stop fighting even when it was clear that they were far
past their primes. Since Rocky Marciano retired undefeated in Mike Tyson has joined a long line of heavyweight champions who
refused to stop fighting even when it was clear that they were far past their primes. Since Rocky Marciano retired undefeated in 1955
at age 32, the only heavyweight to retire a champion has been Lennox Lewis, in 2004. Some other top heavyweights and the points
at which it became obvious that they had fought too long:

joe louis muhammad ali larry holmes evander holyfield riddick bowe

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