MLB informs owners of crackdown on pitchers using foreign substances
Thompson excelling with the Triple-A Nashville Sounds, Winchester Star
Is the MLB Sticky-Stuff Ban Actually Making a Difference? - The Ringer
Sun lotion and curveballs: Why MLB is gripped by dubious 'foreign substances', MLB
Is the MLB Sticky-Stuff Ban Actually Making a Difference? - The Ringer
MLB foreign substance crackdown may end up causing hysteria
Drew Smith - MLB News, Rumors, & Updates
2021 pitch doctoring controversy - Wikipedia
Sticky stuff 101 - Everything you need to know as MLB's foreign-substance crackdown begins - ESPN
With Foreign Substances, MLB Faces Crisis of Its Own Making - The New York Times