Gordon Gair began his career with the Mimico juveniles in 1934, leading his club to the Ontario championship.
He played for the Mimico juniors until 1936, then graduated to the senior club. He won the Jimmy Murray Memorial Trophy and the Queme medal as the outstanding player in 1946. He won the Ontario scoring title for two years. While in junior Gord was frequently called up by the seniors to assist them.
He was also chosen to the Canadian all-star team that represented Canada in Baltimore in 1946.