Darcy Rae Fast (born March 10, 1947) is an American former professional baseball player, a left-handed pitcher in the Major Leagues in 1968 for the Chicago Cubs.Fast's only MLB decision was on July 4, 1968, pitching in relief in the second game of a doubleheader when the Cubs hosted the Philadelphia Phillies. Surrendering 4 runs in 32⁄3 innings of work, he was the losing pitcher in the 7–4 loss.Fast appeared in eight MLB games for the Cubs, and struck out ten batters in ten innings pitched.