What is the 3 batter minimum rule?

Related questions

1. What is the most baseballs used in one game?
2. What does H mean in baseball pitching?
3. Is there a mercy rule in MLB?
4. How do you score in baseball?
5. Is NLCS a 7 game series?
6. How is NLCS home field advantage determined?
7. Why do baseballs have 108 stitches?
8. What is considered a save in MLB?
9. What is a good OPS stat in baseball?
10. What do they rub on baseballs?

Tags

1. #injured
2. #least
3. #states
4. #pitcher
5. #during
6. #current
7. #every
8. #unless
9. #batter