Baseball Stars and Bases Loaded II? You missed out on the real NES baseball gem, my friend: Baseball Simulator 1.000. Greatest thing ever. Especially since you could create your own players, editing names, skills and even selecting whether a pitcher threw over the top, 3/4′s or submarine.
http://upload.wikimedia.org/wikipedia/en/7/7c/BaseballSimulatorNESBoxart.jpg