Zenner has taken the lead over Stevan Ridley for the Lions' power-back role, MLive.com reports.
This competition is likely far from over, but after alternating first-team reps throughout training camp thus far, Zenner received most of the work out of the backfield during Detroit's preseason opener last Friday against Pittsburgh. Ridley, however, didn't even take the field until the second half. Ultimately, it is still just Week 1 of the preseason and depth charts are far from finalized, but Zenner nonetheless appears poised to claim the Lions' No. 3 RB job behind Ameer Abdullah (shoulder) and Theo Riddick.