Ah, are you too young to remember the famous baseball player Micky Mantle? That is what this poem is about. The author is remembering the amazing career of this player (who was from Oklahoma, by the way, just as the poem says) who could bat either right handed or left handed (also alluded to in the poem). The author says that as a boy, he followed Mantle's career, hoping he would retire from baseball before his batting average started to drop. Sadly, Mantle did not do this, says the author, and now, he is good for nothing but TV commercials:
He makes Brylcreem commercials now,
models with opened mouths draped around him
Brylcreem was a men's hair gel back in the day. The last paragraph sadly realizes that Mantle's excellent batting faded into something so much less - like a model's smile. How much better to be batting in a baseball game than to be hawking Brylcreem. The poem's theme is that nothing lasts forever. It is pretty sad.