Football has always measured success by what you win, but only in the last twenty years have clubs started to think about how you win. Data has now suffused almost every aspect of how football is played, coached, scouted and consumed. This is the story of modern football's great data revolution and the group of curious, entrepreneurial personalities who zealously believed in its potential to transform the game. Central to this cast is Chris Anderson, an academic with no experience in football, who saw data as an opportunity to fundamentally change a sport that did not think it could be changed. Expected Goals charts his remarkable journey into the heart of the modern game and reveals how clubs across the world began to see how data could help them unearth new players, define radical tactics and plot their path to glory.