Don’t miss your chance to snag autographs from two of baseball’s most storied sluggers. Submit your collectibles for Mark McGwire. Sammy Sosa, or both to autograph in their upcoming PSA Autograph Series signings. Items must be received at PSA by August 27 to be eligible.
Start your submission today: psacard.click/Auto-HR-x
— @PSAcard Aug 13, 2026
