Boxing in the 1970s was world champion when Ali returned. Former world champions Jimmy Ellis and Floyd Patterson as well as George Foreman, Oscar Bonavena, Jerry Quarry, Earnie Shavers, Leon Spinks, Ken Norton, as well as Larry Holmes, Ron Stander, Chuck Wepner, Jose King Roman, Light Heavyweight champ Foster, John Tate, Jimmy Young, Ron Lyle, Joe Bugner, Scott LeDoux and many others added intrigue to the division. Don King surged as a leading boxing promoter, and champions Duran, Monzon and Ali had historic rivalries with Esteban De Jesús, Rodrigo Valdez and Frazier, respectively. Boxing in the 1970s During the 1970s, boxing was characterized by
Boxing at the 2011 Pan American Games – Heavyweight Boxing at the 2011 Pan American Games – Heavyweight Men's heavyweight boxing competitions at the 2011 Pan American Games in Guadalajara will be held from October 22 to October 29 at the Expo Guadalajara Arena. Heavyweights were limited to those boxers weighing less than or equal to 91 kilograms. The defending champion was Osmay Acosta from Cuba. Like all Pan American boxing events, the competition was a straight single-elimination tournament. Both semifinal losers were awarded bronze medals, so no boxers competed again after their first loss. Bouts consisted of four rounds of two minutes each, with one-minute breaks between rounds.