 In , he was able to make the Yankees' major league roster.He performed well in his first season with the Bombers, earning an 11–3 won–lost record with a sparkling earned run average of 2.31 in 33 games, including 12 starts, and 132 innings pitched.Hampered by a sore elbow, Gumpert appeared in fewer innings the following season and his ERA ballooned to 5.43, but still compiled a 4–1 record, as the Yankees won the American League pennant.