Best Fantasy Week 4 Waiver Pickups: Handcuffs Khalil Herbert, Alexander Mattison take over after David Montgomery, Dalvin Cook injuries

[Matt Lutovsky]

The injury bug struck in a big way on Sunday, with starting RBs David Montgomery and Dalvin Cook exiting early. That opened the door for Khalil Herbert and Alexander Mattison to take over and be among the top Week 4 fantasy waiver pickups and free agent adds.