Sir Alex Ferguson noticed that defender Jaap Stam was making fewer tackles than in previous seasons. The data convinced the manager that Stam was past his prime, leading Ferguson to transfer him to Italian club Lazio. But in reality Stam was making fewer tackles because he was making more interceptions and keeping the ball more as a result: his performance was improving, not declining. Ferguson later conceded, “without a question, I made a mistake there. Jaap Stam was the one.”