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MLB cracks down on pitchers using foreign substances to doctor baseballs: Five things to know - CBSSports.com
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Cardinals Shildt on pitchers using foreign substance for grip, baseball's stickiest issue: 'Yeah, it's a problem'
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MLB to step up 'sticky stuff' checks on pitchers amid crackdown on illegal foreign substances, per report - CBSSports.com
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Nightengale: MLB Crackdown on Pitchers and Illegal Foreign Substances Starts Next Week | The Sport Digest
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