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Ryan Mathews, RB, San Diego Chargers: Former Chargers GM A.J. Smith made the bold move to draft Mathews as the replacement for perennial All-Pro running back LaDainian Tomlinson. However, Mathews has failed to live up to expectations, with only one 1,000-yard season in his three-year career. While injuries and a leaky offensive line have contributed to Mathews' struggles, the fact that he hasn't shown the consistency or durability to handle the workload as a feature back has placed an enormous burden on Philip Rivers to carry the offense on the strength of his right arm. Without even the semblance of a balanced approach, the Chargers' offense hasn't been as productive or explosive in recent years. With Mike McCoy and Ken Whisenhunt hoping to feature a more efficient offensive attack, Mathews must become the player the Chargers envisioned when they selected him with the No. 12 pick of the 2010 NFL Draft.

http://www.nfl.com/news/story/0ap1000000209439/article/blaine-gabbert-ryan-mathews-among-10-guys-who-must-step-up