The ad-free version of 9 Innings: 2013 Pro Baseball is free today from Amazon. I have installed it, but haven't had a chance to play it yet, so I can't say how good of a game it is. It has a low user rating, but the vast majority of the negative reviews are because the game doesn't run on rooted devices. If you don't know what a rooted device is, you don't have to worry. Either way, the game won't cost you anything, so long as you get it today.
Here is the trailer for the game: