 If you liked
Princess Nine: Kisaragi Joshikou Yakyuubu
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 ...then you might like
One Outs
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Also about the same sport, but as opposed to the analytical and one-upmanship of One Outs, Nine has more drama, more romance, more 'heart' one might say. Whereas in the former the characters serve as props to develop a narrative, in the latter they're fleshed out, some given an episode to themselves and their lives, and then the anime has group-based drama/interactions, whereas in the former it's confined mostly to the games themselves (with the only drama being about the business of the professional side of the game).