On 19 March 1955, O'Connor won the NWA World Tag Team Championship (Chicago version) with tag team partner Roy McClarity, and held the title until February 1956. Later in the year, he worked for Maple Leaf Wrestling. In March, he won the NWA British Empire Heavyweight Championship (Toronto version), but lost it on 2 May 1957 to Gene Kiniski. That same month, O'Connor and Whipper Billy Watson won the NWA Canadian Open Tag Team Championship, but lost it to Gene Kiniski and Fritz Von Erich on 31 October of that year.