PSA AutographFacts™ - Mark McGwire | Marks, Athlete, Signed photo
A's best trades under Billy Beane have come in the offseason, not midseason
Baseball Reference on Twitter: "Matt Chapman is the 9th 3B in MLB history to post 8+ WAR in a season at age-25 or younger https://t.co/0XOXfBvFlZ https://t.co/7YjfelBYFU" / Twitter
Angel Felipe Career Stats - MLB - ESPN
Sam Moll - Wikipedia
Best MLB fun facts of 2018: Oddest statistical quirks - Sports Illustrated
Negro League stats added to Baseball Reference website - Sports Illustrated