Like the bestselling Baseball Prospectus annual, this midseason debut provides the latest scoops and analysis to help super-fans follow their favorite teams, and fantasy players win their leagues. July and August is when the smartest teams pull off the big trades or see big contributions from previously obscure rookies. This book pulls out the teams and players with the most crucial updates since the start of the season, with plenty of articles, lists, and leaderboards. The Call-Up also offers some major innovations in sabermetrics, like Mike Fast's groundbreaking work on measuring the value of a catcher to his pitchers.

Baseball Prospectus is America's leading provider of statistical analysis for baseball, combining entertaining commentary and accurate forecasting via books, blogs, articles, and a website.