The Colts improved their run defense for one reason: stopping the Patriots. They'll get a chance to see just how well they've done at that this Sunday night.
The Indianapolis Colts and the New England Patriots have played four times since the start of the Andrew Luck era (2012), and it has been a very one-sided matchup. During those four games, the Patriots have gone 4-0 and have dominated in every aspect - outscoring the Colts 189-73, with the average margin of victory being 29 points.
The main area of dominance for the Patriots has come in the ground game, as they have run all over the Colts in their four meetings.