1
They put a fish on board 2 (or even 1), punt that game (or hope to maybe draw it) and then try to sweep the other games.
It can be very effective, and honest teams hate to see that kind of stack.
..........
During the MLB regular season, though, the rotations tend to get pretty jumbled and it's rarely 1 vs 1, etc., in June.
Might be worth a thought for managers who, having days off, are setting a month's rotation in August, though.