Dan Clasgens puts rankings under the microscope to identify players whose stacks are on the rise or falling after the first week of action. Check the full PFF Fantasy staff rankings for more.
VIDEO: Fantasy risers and fallers heading into Week 3

GLENDALE, AZ - DECEMBER 10: David Johnson #31 of the Arizona Cardinals runs with the ball against the Minnesota Vikings at University of Phoenix Stadium on December 10, 2015 in Glendale, Arizona. (Photo by Norm Hall/Getty Images)
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