DeSean Jackson out with hamstring injury

Washington Redskins star wide receiver DeSean Jackson missed the remainder of Sunday's season opener against the Miami Dolphins after suffering a hamstring injury in the first quarter.

Redskins coach Jay Gruden said after the game that Jackson will undergo an MRI on the hamstring. The Dolphins beat the Redskins 17-10.

Jackson suffered the injuryon the first play of the Redskins' second series, when he ran a deep route on an overthrow by quarterback Kirk Cousins.

"Any time you lose a guy that runs a 4.25 40, it damages some of your play-action game," Gruden said. "The first one we threw to him, he had a step [on the corner] and I believe he would have caught it if he didn't pull his hammy.

"It's a great throw by Kirk, and that's the last we saw of him -- and we had another seven or eight [plays] built in to clear out and get DeSean across the field. It was a big loss for us."

Jackson, who missed the entire preseason with a grade 2 separated shoulder, grabbed at his leg after the play and was worked on by trainers for several minutes on the sideline.

The Redskins initially listed Jackson as questionable to return before eventually downgrading him.

With Jackson sidelined, the Redskins lose their best deep-ball target. Second-year receiver Ryan Grant replaced him in three-receiver sets but lacks the deep speed to threaten defenses. Jackson led the NFL with 13 catches for 40 or more yards last season.