16. George Foreman vs. Michael Moorer
Foreman went into sharp decline after losing to Ali. He retired for 10 years before sealing his legacy in a dramatic as possible fashion. The 45-year-old fought 27-year-old Moorer in 1994 for the heavyweight title. Although Moorer appeared able to land at will, Foreman wore down the champion.
He scored some significant blows that softened up Moorer. By the time he landed the big right hand that finished the fight, Moorer had nothing left. Foreman became the oldest man to win the heavyweight title, sending the boxing world into shock. What a comeback story.