The 49ers’ 90-man roster has taken shape, and camp battles are already developing on paper with organized team activities due to open May 20.

Some positions won’t have a lot of competition. Jimmy Garoppolo is locked in at the top of the depth chart. So are players like George Kittle and Dee Ford. Other spots will have a ton of competition based on the personnel on the roster going into OTAs. This is our seven-part series on the biggest roster battles we’ll have an eye on throughout the offseason

Perhaps the biggest and most important battle that’ll take place over the course of the offseason is at starting cornerback. The 49ers had arguably the NFL’s worst pass defense last season, and didn’t make many changes at cornerback.

Instead, the front office and coaching staff will rely on competition at the position to elevate the untapped potential they believe resides on the roster.

The contenders

Richard Sherman – Year 9
Ahkello Witherspoon – Year 3
Tarvarius Moore – Year 2
Jason Verrett – Year 6
Tim Harris – Rookie