The Indianapolis Colts are playing with a lot of confidence after beginning the season 3-0. Indy is one of the few teams left that hasn't lost a game. To be fair, however, the Colts have not had an overly difficult schedule so far.
That changes in Week 4 when Indianapolis travels to Los Angeles to play the 2-1 Rams. LA's only loss so far this season is to the defending Super Bowl champion Philadelphia Eagles. The Rams played well enough to win that game, and likely would have except for special teams mistakes.
LA is exceedingly good defensively with the kind of unit that can limit a Colts offense working at peak efficiency, at least as far as getting points on nearly every day.