Listed at 5 feet 9.5 inches (1.765 m) and 170 pounds (77 kg), he threw and batted right-handed.

[3] In August and September 1922, Ketchum pitched in six games for the Philadelphia Athletics,[4] the only major league appearances of his career.

[5] The Athletics had purchased his contract from the minor league Ardmore Producers for $1750 on July 11.

[5][6] In six relief appearances totaling 16 innings, he compiled an 0–1 record with a 5.62 earned run average while striking out four batters.

[5] His loss came on August 11 in a road game against the New York Yankees at the Polo Grounds; entering a 2–2 tie game, Ketchum pitched a scoreless eighth inning, then allowed a run in the ninth on two walks, a sacrifice bunt, and a game-winning single by opposing pitcher Bullet Joe Bush.