15. Ryan Mathews, San Diego Chargers
The Chargers grabbed Donald Brown in the offseason, but insist that Matthews will continue to be their bell cow. Even with losing snaps to Danny Woodhead last season, Matthews set new career-highs in most categories, finishing with 285 carries for 1,255 yards. Perhaps most importantly, he played 16 games for the first time in his career. (Jeff Gross/Getty Photo)
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