When John Farrell was introduced as the new Red Sox manager in the fall of 2012, he took over a last-place team lacking talent and cohesion. A franchise that once made Boston proud had become an embarrassment. Just one year later, the Red Sox have won the World Series, their third title in a decade. There were many keys to the team's success: General manager Ben Cherington remade the roster with a series of mid-range free-agent signings. The returning...