Lyman played his final year of professional football as a member of the 1934 Bears team that compiled a perfect 13–0 record in the regular season and won the NFL Western Division championship, but lost to the Giants in the 1934 NFL Championship Game. After the 1934 season, Lyman was selected as a first-team All-Pro by the United Press, "Green Bay Press-Gazette", and "Collyer's Eye". Bears' coach George Halas later observed that Lyman was "stronger and tougher during his last two seasons than when he first joined the team eight years earlier."