Official Rules(view all)

6.02 (b) (8.01 (d)) Illegal Pitches With Bases Unoccupied

If the pitcher makes an illegal pitch with the bases unoccupied, it shall be called a ball unless the batter reaches first base on a hit, an error, a base on balls, a hit batter or otherwise.

Rule 6.02(b) Comment (Rule 8.01(d) Comment): A ball which slips out of a pitcher’s hand and crosses the foul line shall be called a ball; otherwise it will be called no pitch. This would be a balk with men on base.