In the late 1950s, Istaz moved to the United States, and began wrestling as Karl Gotch. In the United States, Gotch's wrestling style and lack of showmanship held him back, and he did not experience any great popularity at the time. In 1961, he won the American Wrestling Alliance (Ohio) World Heavyweight Championship. Gotch held the belt for two years before dropping the title to Lou Thesz, one of the few American wrestlers he respected because of the similarities of their styles (the two also share a common German/Hungarian heritage). In 1962, Gotch was involved in a backstage altercation with the then-NWA World Heavyweight Champion "Nature Boy" Buddy Rogers, in which Rogers was injured. The incident alienated Gotch from American promoters, and he began looking for work in Japan.