Official Rules(view all)

NFHS 6-1-3

NFHS 6-1-3/OBR 5.07a2, 6.02a5

If there are no runners and a pitcher is using the stretch position, and the pitcher fails to come set before delivering the pitch to the batter, it is an illegal pitch. The umpire should call time and add a ball to the count.

[OBR: must just be certain the pitcher is not quick-pitching the batter (delivering in a manner that catches the batter off guard).]