Ryan Mathews has “no doubt” he’ll play Week One

Last Thursday, Chargers running back Ryan Mathews fractured a clavicle on his first carry of the preseason.  A week later, he told XTRA Sports 1560 that he has “no doubt” he’ll be ready to go in Week One, when the Chargers face the Raiders on Monday Night Football. The three-year veteran said that he’s out…