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.

The slot corner competition could probably fit under the general cornerback umbrella, but the 49ers have such an intriguing battle that it needed its own post. K’Waun Williams started as the team’s nickel corner last season, but wound up missing two games, allowing rookie defensive back D.J. Reed Jr. to slide into that spot. Reed thrived, and now there’s a real question about how San Francisco will iron out that spot on their roster.

Here’s what the slot corner competition looks like:

The contenders

(Photo by Kevork Djansezian/Getty Images)

K’Waun Williams – Year 5
D.J. Reed Jr. – Year 2