The Dolphins offense was nothing short of pathetic, finishing with a paltry 98 total yards.
The defense, meanwhile, didn't come up with any turnovers and allowed 181 rushing yards.
Stoerner, who is not expected to make the 53-man roster, completed only one of seven passes for minus-4 yards.
The Dolphins running game got off to a solid start as Travis Minor gained 11 yards on his first three carries, but that was it. He gained only 4 yards on his next five carries and finished the first half with 15 yards on eight carries, less than 2 yards per attempt.
Washington took the lead on its first drive by marching 63 yards in eight plays, the score coming on Clinton Portis' 1-yard run.
The lead grew to 14-0 in the second quarter when Rock Cartwright scored on a 1-yard run. The score culminated a drive that saw Washington convert three third-down situations.
The Dolphins' first drive easily was their best of the first half as they moved to the Washington 40-yard line, thanks largely to an illegal contact penalty on Redskins rookie Sean Taylor on third down.
But Chris Chambers fumbled after catching a slant from Feeley when he was immediately hit by Taylor.
It was one of two turnovers by the Dolphins. The other came when Fiedler fumbled on a quarterback sneak when the Dolphins went for it on fourth-and-1 from the Redskins 36-yard line early inthe second half.
Fiedler came into the game at the two-minute warning and moved the Dolphins to the Washington 45-yard line thanks in large part to a 19-yard completion to newly signed wide receiver Antonio Freeman.
But the drive stalled after three straight incompletions.