As manager Frederick Francis Mitchell, born Frederick Francis Yapp (June 5, 1878 – October 13, 1970), was an American right-handed pitcher, catcher, first baseman and manager in Major League Baseball.

Mitchell appeared in 97 games over the course of twelve years as a pitcher that sometimes dabbled in the infield.

He was noted for relieving Hall of Famer Cy Young in the first-ever Red Sox game.

The Cubs would go 84–45 (with two ties) while finishing first in the National League despite having their star pitcher in Grover Cleveland Alexander leave the team to serve in the war.

Mitchell's two subsequent seasons resulted in the same number of wins while other National League teams passed them by, and he was let go after finishing fifth (18 games behind) in 1920.

He rebounded them to a 79–74 record (a seventeen-game improvement), good for a fourth-place finish.