Sports Illustrated - Football & Baseball is a sports game for the Nintendo Game Boy, released in the USA. While details on its specific gameplay mechanics are scarce, it's likely the game offered a simplified simulation of American Football and Baseball, common for sports titles on the system at the time.  Given its association with Sports Illustrated, a prominent sports magazine, the game probably aimed for a realistic representation of these sports, albeit within the technical limitations of the Game Boy.  The developer and publisher are currently unknown.

Sports Illustrated - Football & Baseball (USA)

Splitz - Nigaoe 15 Game (Japan)