Well, in Malaysia they don't have baseball, but I am pretty sure that they have football. (AE: soccer) There you would find a practical application of keeping your eye on the ball. If you don't keep your eye on the ball you will lose track of it, and the other team will surely score on you.
Here's something you might find interesting:
The poster asked a question about a word I had never heard before, and I was mildly surprised to find that the word came from Malaysia. Apparently, there is a larger English-speaking community there than I realized. (There are certainly
shophouses in this country, but we just never called them that.) Do you use that word?