Change coach and cheerleader between every half inning to boost pitching or hitting. Use best coach and cheerleader to boost loc and erd when pitching and use them to boost eye and connection when batting.
It doesn't matter what you do... The game is preprogrammed to give you hits or outs on every pitch you swing at or pitch.
If you swing at a curve it will turn into a slider or change up at the last second... I have seen pitches that appear to go up, down, turn and then go up again before coming down in the strike zone!
If you use auto play... It will burn through your pitchers and leave you with no relievers the next day. It will also give up big hits and runs in the later innings...(even with closers like Rivera: who is level 3 pitching to level one batters) so finish all your games yourself.
In the field... Use your cut off man, do not throw to base even if it is closer than the cutoff man. The exception is of course if you trying to amke a play at that base (second, third or home), then, DO NOT use the cut off man, it only slows down the throw and speeds up the runner.
Leveling upcards... COMPLETELY random. You can fail to level up a card, try again and succeed or fail three times in a row and then succeed... It is TOTALLY random and has nothing to do with experience or abilities or type of card...
Also... I have played 1 level cards against 6 level in hard mode and they perfom EXACTLY the same as they did when they were level 4. So... It is a way to eat up your points... Better to use them to level up your coaches.