Building a good team
Start a franchise or season. When you get to the season, go into the "Edit" category and select your player. Choose to move the player to another team. You then can have any desired star on your team. After your first season you will lose some players due to the fact you will be over budget, but you can do this trick again. To get better ratings for other players, do the same thing by selecting a player and then editing the desired category up or down.
Easy fly ball catches
When you are in the outfield and are not sure where the ball is going to land because of the wind, the outfielder will lock on the ball to make an easy catch. Note: This only works under the rookie difficulty setting.
Easy homerun
While batting, press Start button and switch teams. Resume the game and the other team will be batting. Make sure that the ball is in the center (rookie mode), then switch back to your original team. Swing the bat and you will have a good chance of a homerun.