Clarence Robert Janecek was born on April 1, 1911, in Chicago, Illinois.

[1] Janecek signed with the Pittsburgh Pirates of the National Football League (NFL) in 1933.

[4] The Pirates finished in fifth place in the Eastern Division with a 3–6–2 record in league games.

[3] He played in two games for the St. Louis/Kansas City Blues of the American Football League (AFL) in 1934.

[1] He also appeared in five games, all starts, for the AFL's Dallas Rams that season as well.