Las Vegas Raiders running back Alexander Mattison will take on the Kansas City Chiefs in Week 8. He had to compete with fellow RB Zamir White for touches, but took the lion's share of the backfield work. The former Viking rushed 23 times for 92 yards and caught three passes for 31 yards in the team's 15-20 loss to the Los Angeles Rams last week. He'll face a much tougher defense this week. The Chiefs have allowed just 14.0 PPR fantasy points per game to opposing running backs -- no other team ...