Dec 16, 2012; Oakland, CA, USA; Oakland Raiders running back Darren McFadden (20) fumbles the ball as he is tackled by Kansas City Chiefs inside linebacker Brandon Siler (52) and inside linebacker Derrick Johnson (56) during the fourth quarter at O.co Coliseum. The Oakland Raiders defeated the Kansas City Chiefs 15-0. Mandatory Credit: Kelley L Cox-USA TODAY Sports