With the start of spring football now less than a week away, it's time to look at four players on the defensive side of the ball who could be headed into make-or-break springs. 

These 15 practices will be particularly important for DT Jason Moore, LB Garrett Stover, CB Miles Lockhart, and SAF Leroy Roker, all of who have to fend off talented younger players, high-level transfer additions, or both, to keep their spots on the depth chart and position themselves for bigger roles in the future. 

Tony Gerdeman of BuckeyeHuddle.com joins host Tom Orr to discuss why the next 15 practices could be particularly crucial for each of those Buckeyes.