Owners of Chargers running back Ryan Mathews can start to worry about his chances of playing Sunday, after the third year back missed practice for the second consecutive day with a neck injury. Mathews suffered the injury after a helmet-to-helmet collision with Buccaneers linebacker Quincy Black last week. Black was hospitalized and later placed on injured reserve by Tampa Bay with a neck injury of his own.

The injury prone back hasn’t had a 100-yard game yet this season, after recording four last season alone. Mathews owners have been frustrated all season with his slow start – missed first two games due to injury – and his history of fumble problems – two lost on the year, seven lost in career – making him an early candidate for an early round bust.

If you need help at running back, you can go after Ronnie Brown (12 percent owned in Yahoo! / 7.8 percent owned in ESPN leagues) or Jackie Battle (12 percent owned in Yahoo! / 16.7 percent owned in ESPN leagues). Both will be in tough against a Broncos defense that allows 98.3 yards per game on the ground, good for 10th in the league.