Dan Clasgens puts rankings under the microscope to identify players whose stacks are on the rise or falling after the first week of action. Rookie receivers are trending down, while pass-catching running backs are going the other way. Check the full PFF Fantasy staff rankings for more.
VIDEO: Fantasy risers and fallers heading into Week 2

Santa Clara, CA, USA; Dallas Cowboys wide receiver Michael Gallup (13) celebrates after a touchdown against the San Francisco 49ers during the first quarter at Levi's Stadium. Mandatory Credit: Kelley L Cox-USA TODAY Sports