Easy wins
To make a shorter and easier season, change the game settings to "1 Inning" and select a team with good pitching and batting. A good team to use are the El Condors, since Ghost is a good pitcher and Cruz is a good batter. Choose to be the away team and bat first. If you do not score a run in the inning, restart the game. When you play defense, move your pitcher all the way to the same side as the batter is located. For example, if the batter is on the left side, move your pitcher to the left side. Then, when pitching, hold Down/Away from the batter. Your pitcher will throw a fast curveball. The batter will almost always strike out.
Unlocking new teams and players
Successfully complete a pennant race and defeat all opposing teams. After the animation, you will be awarded with a bonus player and/or bonus team. After you get enough players, you can create your own team using the two player mode.