Baseball Highlights: 2045 – Spring Training is an introductory version of Mike Fitzgerald's highly acclaimed deck-building game Baseball Highlights 2045 with an updated, revised and expanded rulebook, step-by-step play examples, and a reference guide.

Baseball Highlights: 2045 is played as a series of mini-games, each of which lasts about 4 to 7 minutes. In each mini-game, each player draws and plays a six-card line-up drawn from their 15-card roster of active players. At the end of each mini-game, a winner is determined, and new players are bought. A team must always be 15 players, so for each new player bought, one of the existing players is sent down to the Minor Leagues.

The player who wins the most mini-games in the series is the overall winner.