Ryan Mathews is off and running this preseason, and Jonathan Cooper's season could be over before it really began. Mathews, slowed by two broken collarbones a year ago, carried 14 times for 57 yards and a touchdown, and the Chargers beat the mistake-prone Cardinals 24-7 for their first preseason victory under new coach Mike McCoy. Mathews did fumble the ball at the Arizona goal line, but even that play turned in to a San Diego touchdown.
