- use custom stadium that has high elevation and very low walls.
- start fresh season until first game is a "vs" against a weak pitcher.
- Set it to rookie.
- Don't worry about letting them score until the top of the 3rd. Get 2 outs, then walk in runs until they get to 9. Then get the final out. This way, if you score 10 runs the game is over, but if you only get to 9 you get extra innings.
This is the easiest way