MLB Says It Used 2 Different Balls in 2021, One Bouncier Than Other
MLB reportedly used two different baseballs last season
MLB will deaden the ball in 2021 - Bleed Cubbie Blue
A major-league baseball vs. a Triple-A ball: Can players tell the difference? – Orange County Register
What is MLB arbitration? Explaining the rules, eligibility & how the process works
MLB standardizes how baseballs are prepped to be put in play
MLB study says balls weren't intentionally juiced in 2019; home run spike credited to seams, launch angles
MLB Used Two Balls Again This Year, and Evidence Points to a Third
MLB Authentication, Hologram Authenticator
Rawlings Puts the Ball in Baseball
Why MLB's baseball draws scrutiny and suspicion - The Washington Post
Yes, the baseball is different — again. An astrophysicist examines this year's baseballs and breaks down the changes - The Athletic
MLB to test electronic device for catchers to give signals to pitchers - ESPN
How many seams are on an MLB baseball?
Scott Stinson: Major League Baseball has a dead-ball problem. Again