There are, of course, numerous "Peanuts" strips that reference Willie Mays, most notably the sequence where Charlie Brown loses a school spelling bee because he spelled "maze" as "Mays." Here's a deep cut, from September 28, 1964.

I've often thought that this strip from February 15, 1966, when Charlie Brown flubbed the spelling bee, was directed at Mays himself, Schulz's way of imagining such a conversation between the two.