Don_Mattingly
Mattingly, Jeter together again, but in different roles with Marlins
Don_Mattingly
Why can't you have a beard on the Yankees? - Quora
Banning beards in baseball is completely backwards - The Gateway
He was miraculous': The José Fernández free agency that never
Don Mattingly – Society for American Baseball Research
Baseball's Best Facial Hair: Past And Present - CBS Miami
Miami Marlins' New Manager Outlaws Facial Hair On His Players
It's time for the Yankees to update their facial hair policy
Don Mattingly under the microscope after Marlins' season-opening
Don Mattingly has relaxed the Marlins' facial hair policy