Hamann was one of a group of players that Indians player-manager Tris Speaker sent in partway through the game on September 21, 1922, done as an opportunity for fans to see various minor league prospects.

For shortstop Chick Sorrells, third baseman Ike Kahdot and left fielder Joe Rabbitt, all of whom had made between 1–3 appearances earlier in the month, this would also mark the final major league game of their careers.

Hamann entered the game in the ninth inning, taking over from Logan Drake, who was also making his major league debut.

With the Indians already trailing 9–5, Hamann walked Johnny Mitchell and Ed Chaplin, then hit opposing pitcher Jack Quinn.

Only after Del Pratt followed with another single did manager Tris Speaker pull Hamann, who also threw a wild pitch in what was his only major league appearance.