Super Hit Baseball is a game of skill as much as it is preparation. Choosing the right players to field is key, but being able to hit the ball where you want is the heart of the game.
Try tapping Play Ball from the main menu and heading into Batting Practice. Here, you can practice your swing without worrying about losing. Pay attention to how far over the plate the ball is when you swing, and pay attention to the indicator telling you where the ball was struck. Practice and experience, plus leveling up your cards, will help you better put the ball where you want!