At Worcester Academy, he met Roy McGillicuddy, the son of Connie Mack, and a month after his graduation, he joined the Philadelphia Athletics.

He is most remembered for setting an American League record (tying the major league record held by Bill George and George Van Haltren) for most batters walked in one game with 15.

[1] Following his inauspicious debut, Haas pitched in just five more major league games, all in 1915.

Haas also played tailback in the NFL with the Akron Pros, Cleveland Indians and Dayton Triangles.

In 1933, he helped to found the fourth incarnation of the Northern League, joining the Winnipeg Maroons for the rest of his playing career.