This is an insider account of the data revolution that has swept through the modern football world written by one of its key architects, Ian Graham. Between 2012 and 2023, Ian Graham worked as Liverpool FC's Director of Research. His tenure coincided with the club's greatest period of success since the 1980s, including winning the Premier League in 2020 - Liverpool's first league title after an agonising 29 years. Here, Graham reveals the fascinating data that informed some of the club's most pivotal moments of the past decade, from the appointment of Jurgen Klopp as manager in 2015 to the signing of Mohamed Salah in 2017.