2015 was the ultimate in years of frustration for former Pitt running back Dion Lewis. He had finally returned after a fibula injury in 2013 with the Cleveland Browns. When he returned, he didn't make the Browns team in 2014 and failed to land on a roster with the Indianapolis Colts that season, either. The New England Patriots gave him a chance and, in the midst of a nice year, tore his ACL.
Things were finally working out for him until the injury forced him to essentially start over. Again.
The promise he showed in 2015, however, gave the Patriots enough to work with and he returned this season.