Bob Backlund
Frank Gotch won the title from Hackenschmidt on April 3, 1908 and he held the title for five years until his retirement on April 1, 1913. He was the sixth longest reigning world heavyweight champion in history behind Bruno Sammartino, Jim Londos, Lou Thesz, Verne Gagne (who all held their world titles for over seven years) and Bob Backlund (who held his for nearly six years).