There is only one thing stopping Adrian Peterson from becoming the best running back in the NFL: frailty.

Results from an MRI are in, and it turns out, the former Oklahoma star tore a knee ligament against Green Bay. The good news is that he'll only be out a week.

The bad news is, "Here we go again."

As much as I like A.D. as a back and as a person, he has Fred Taylor written all over him, and I just have a hunch he'll never achieve what he could because of injuries.