Scouted by AJPW promoter Giant Baba, he was sent to the local Amarillo, Texas promotion in the U.S. to train as a pro under Dory Funk Jr. Known as "Tommy Tsuruta", he worked in several major NWA territories including Detroit, St. Louis, and Florida as well as West Texas. He was among the first Japanese wrestlers to be cheered by an American crowd, due to his hard work ethic and wrestling ability. The name "Jumbo" was given to him by a fan contest in Japan to replace his given name, which was seen as too feminine. He defeated Nick Bockwinkel on February 23, 1984 to win the AWA World Heavyweight Championship in Tokyo, Japan. He would lose the title to Rick Martel on May 13, 1984 in St. Paul, Minnesota. Tsuruta and Yoshiaki Yatsu became the first World Tag Team Champions on June 10, 1988.