Mystery Theme VIII: Baseball by KlionskyG

Question 8

Cy Young Winners, part IV
What did Wally Backman use to prank his first base coach in the South Coast League? At the Major League level, Miguel Sano used a similar (but less lively) one to prank his pitching coach with the Twins. This also appears in the nickname of a 2015 Cy Young winner and, per Baseball Reference, was the first name of three players who played 90+ years ago.

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