Ok I will impart some wisdom.
For pitching... I find this method to be successful, considering I've struck out a good 15-25 guys a game (on medium), is that I always pitch the first two balls fastballs to the lower corner that is "cold" it will be displayed as blue, and if you're up in the pitching count like 2-0, then it usually work to throw a wicked curveball at the high corner (take your pick which). Works well.
As for the batting, just tilt your control stick up a little, and whack the hell out of the ball.
Fielding- I have no idea considering no one ever really hits well against me.