Do you remember the fight between Foreman and ALI....Foreman had him for 8 rounds I believe when exausted and tired of Ali's rope a dope strategy ....he got KO and he failed to make the count..No one would give Ali a chance against Foreman but his strategy worked out perfectly..
Ali's plan was to enrage Foreman ---which he did succesfully--and absorb his best blows in order to exhaust him mentally and physically. By the 8th round Foreman was exhausted and ALi took advantage of it..
Speaking of Foreman his comeback at 45 to regain the heavyweight championship was amazing...