One highlight of the book, Moneyball, was that it showed how a low payroll team can consistently outperform other teams through the use of sabermetrics. As sabermetirics has become more widely used, one team has used "the numbers" to win two of the last six World Series while others have continued to ignore them with disappointing results. In this book, Jim Frank examines the statistical differences between the American and National Leagues and shows which teams have used the information to their advantage.