Ah, okay. In a couple of cases at least (Air Bud and Angels in the Infield), I forgot about the "Direct to Video or TV" sequel love affair that Disney's had over the last 10 years or so.
I just did a search as well (just "baseball movies" in the AOL search), and
Tiger Town from 1983 came up. Never heard of that 1 either. No doubt wikipedia and IMDB will be coming in handy this weekend...