He ended Verne Gagne's seven year reign when he won the AWA World Heavyweight Championship. He won the Championship four times and had feuds with the likes of Billy Robinson, Dick the Bruiser, The Crusher, Mad Dog Vachon, Jerry Lawler, Otto Wanz, Mr. Saito, Verne Gagne and Hulk Hogan. He competed in the first ever AWA versus World Wide Wrestling Federation (WWWF) World Title Unification match, wrestling WWWF Champion, Bob Backlund, to a double count-out, on March 25, 1979.