George Mrkonic teamed with Oliver Spencer to anchor one of the great lines in Kansas football history during the early 1950s. Mrkonic, a two-time (1950-51) all-conference selection, played left guard on offense and defensive tackle. Mrkonic also handled punting duties during his KU career and led the Jayhawks in punting statistics in 1951. During his three years in the lineup, Kansas compiled a combined 21-9 record, including an 8-2 mark in 1951 and 7-3 record in 1952. Mrkonic was selected to play in the East-West Shrine Game in 1952 and had a brief stint in professional football as a member of the Philadelphia Eagles. He also played one season in the Canadian Football League.