Fantasy football is dominated by running backs. They're the most scrutinized group of players in fantasy football before the season starts and for good reason.
A strong group of running backs can carry your fantasy football team to the playoffs, but a weak group leaves no room for error at any other position. There won't be running back depth to pick up off waivers like there will be for receivers, tight ends and quarterbacks.
That makes running back the most important position on draft day and also the position most criticized in the offseason. It only takes one down year for a running back to go from a consensus first-round pick to an afterthought or one good year to vault him to the top of draft boards.
These three running backs haven't quite dropped out of the top rounds, but they've gone from being considered top-10 fantasy players at their position to late second-rounders or early third-round picks.
That's late enough to provide significant upside but early enough to put any fantasy team they're on at a serious disadvantage if they don't pan out.
All three guys have shown they can be consistent fantasy running backs, and they all come with serious question marks heading into this season.
If you draft them and they live up to potential, you probably win your league, but if they should produce another letdown season, they could cripple your team. That makes them the definition of make-or-break candidates for the 2013 fantasy football season.
All stats used are from ESPN.com unless otherwise stated, and all references to fantasy production assume standard fantasy scoring.