better than expected, and later going the distance against the young hard-hitting great Joe Frazier. In this, their first fight, Bonavena had the future champion down twice in the second round. WBA elimination contests In 1967, after the World Boxing Association stripped Muhammad Ali of the title for refusing to be inducted into the U.S. military, Bonavena participated in that sanctioning body's 1967 tournament to crown a new heavyweight champion. In a strong performance he decked favoured European champion Karl Mildenberger four times, winning by a decision in Frankfurt, West Germany. But he was himself knocked down twice and clearly outboxed by eventual tournament winner Jimmy Ellis in the semi-finals in Louisville, losing by unanimous decision in an upset. Many deemed it the best win of Ellis's career. World Title shot, the Frazier rematch The following year, in 1968, after outpointing Leotis Martin, he got a rematch with Frazier for the heavyweight title in Philadelphia. After a grueling fifteen rounds Bonavena lost the rematch by decision, fighting more defensively than previous. He left with a seriously battered face, as photographed in the Ring magazine. In 1969, he got a draw in a rematch with talented Gregorio Peralta, who he'd outpointed four years earlier for the Argentine title. Versus Ali In December 1970, he fought Ali at Madison Square Garden, in the former champ's second bout after his three-year layoff. Bonavena absorbed punishment throughout but fought well, getting through with various head and body punches. With just under 1:30 left in the 15th and final round, Ali caught Oscar rushing in and decked him with a perfectly placed left hook. Bonavena got up, but was clearly not fully recovered. Ali decked him twice more, and the fight was automatically stopped under the three knockdown rule, giving Ali a TKO (technical knockout). The ending was somewhat controversial, as Ali stood over Bonavena as Bonavena was getting up, never going to a neutral corner as the rules of boxing require, which allowed Ali to quickly knockdown Bonavena twice more and automatically end the fight. After the second knockdown, the referee appears to be attempting to guide Ali to a neutral corner, but Ali brushes the referee's arm away and pursues a wobbly Bonavena. Other matches After the loss to Ali in 1970, he had a brutally tough match with underrated Alvin Lewis, being decked multiple times but eventually winning by disqualification. Bonavena fought