Fetzer was also a professional baseball player. He made his Major League Baseball (MLB) debut on September 4, 1906 as a pinch hitter for the Philadelphia Athletics. In his lone at bat Fetzer failed to record a hit. This would be his only major league game, although he continued to play in the minor leagues, primarily as an outfielder, until 1910. He threw with his left hand and hit with his right. Prior to this professional career, Fetzer played collegiately at Davidson College.