Should we care if pitchers use pine tar?, Bronx Pinstripes

Last night the Yankees got demolished by the Mariners, 10-1, but the only thing fans were talking about after the game was Yusei Kikuchi’s apparent use of pin
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New York Yankees pitcher Michael Pineda ejected after pine tar is found on his neck

Pine tar use should be allowed, controlled - The Daily Illini

Does pine tar benefit pitchers? - Over the Monster

Baseball's most famous 'foreign substance' abuser Gaylord Perry says pine tar is definitely a 'performance enhancing substance' … Tony La Russa agrees – New York Daily News

Almost everyone is using something': Getting a grip on how MLB pitchers are cheating - The Athletic

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2021 pitch doctoring controversy - Wikipedia

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Should we care if pitchers use pine tar?, Bronx Pinstripes