Screwball (Pitch) (1921)

Nick Carter, with his screwball, proved the man of the moment in the first game of the Lone Star league pennant series here Wednesday, which the Gushers won from the Trojans, 7 to 4.Austin Statesman, April 17, 1921, pB12

Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1ST USE: 1921. “[Dixie] Davis had an innovation in the pitching line in the shape of a screw ball that enabled him to stand [George] McBride’s hirelings on their heads” (John A. Dugan, The Washington Post, May 21).