Facial hair in baseball is pretty much a given. It’s not uncommon to find an Abraham Lincoln-looking beard in the Nationals’ bullpen or some Buster Posey-level neck scruff around the league.
I’ve noticed some mustaches here and there - I mean, does anyone remember when Tim Lincecum decided he wanted short hair and a mustache? Not my favorite, but it existed:
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As for the 2018 Giants, Derek Holland not only brought his Kermit impression but he also brought the legacy of his mustachioed days on the Rangers to San Francisco by convincing Hunter Pence to grow his very own mustache.