The Miami Dolphins’ cornerback room is one of the clearest open competitions on the roster, and preseason Week 1 offered the first real snapshot of how that race is shaping up.
Miami has turned the position over almost completely. Jason Marshall Jr. is the only returning cornerback who played more than 200 snaps last season, while Rasul Douglas, Jack Jones and Minkah Fitzpatrick - who logged more snaps in the slot than at safety last season - are all elsewhere now.
The Dolphins addressed the group in two waves: they brought in a batch of veteran free agents, then used the extra first-round pick they got in the Jaylen Waddle trade on Chris Johnson. Johnson has basically been handed a starting role by default, though his talent probably would have put him there anyway.
The bigger question is who lines up next to him.
The opener against Washington gave at least a few clues, even if it came with all the usual preseason caveats. The games don’t count, but the tape still matters. One week into this process, the picture is beginning to take shape.
A.J. Green III, Miles Battle, Marco Wilson and Ethan Bonner came away with the strongest grades among Miami’s corners, according to Pro Football Focus.
Green III topped the group with a 75.4 on 17 snaps, and he backed it up by allowing no completions on two targets while adding a pass breakup. Battle was right behind him at 75.2 on 15 snaps, with no receptions allowed on his lone target and another pass breakup.
Wilson delivered one of the defensive highlights of the day when he picked off Commanders quarterback Sam Hartman. He posted a 66.0 grade across 27 snaps and intercepted the only target thrown his way. Bonner also kept flashing in preseason form, earning a 65.2 grade after allowing one catch on three targets for 16 yards over 32 snaps.
On the other end of the spectrum, Marshall Jr. had the lowest grade of the group at 44.9. That came on only six snaps, so it’s a small sample, and he wasn’t targeted at all.
Recent additions Ahmari Harvey and Nick McCloud also had uneven Dolphins debuts. Harvey played 13 snaps and received a 46.0 grade, while McCloud logged 14 snaps, earned a 48.7 mark, and gave up his lone target for 12 yards.
Alex Austin landed right in the middle. The former New England Patriots corner, who crossed over from the other sideline, posted a 61.0 grade on 20 snaps. He allowed both targets in his coverage area to be completed for 23 yards, which makes him more of a wait-and-see case than a headline either way.
As a group, Miami’s corners were part of a defense that held Washington to 189 passing yards. The Dolphins’ team coverage grade came in at 64.4, good for 17th in the league, though that number also includes work from safeties and linebackers.
By one count, the corners were responsible for just 65 of those passing yards. That’s a solid opening day showing, all things considered.
Not everyone in the room got a chance to help the case. JuJu Brents, Darrell Baker Jr. and Storm Duck did not play because of injury, while Ethan Robinson was injured during the game and later waived with an injury designation on Sunday after a strong outing.
Robinson earned a 66.3 grade on 16 snaps. If he clears waivers, he’ll revert to Miami’s injured reserve list.
For a Dolphins roster in flux, availability matters just as much as performance. The longer those injured corners stay sidelined, the tougher their path becomes. In a camp battle like this one, every snap carries weight.
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