Fancy Curves (1932)

After talking to a young coed in the stands at a game, Ruth agrees to go out to her girls college to give some instruction to their ball team. He does so and when their big game takes place, he's there to coach. When Fat girl Madelynne comes to bat, Ruth trades places with her to make the winning hit, but the subterfuge is exposed, and he's chased off the pitch, escaping on the back of a car.