Dynamo rookie forward Mark Sherrod has suffered a season-ending left knee anterior cruciate ligament tear, coach Dominic Kinnear has told the Houston Chronicle.

“He is done for the year, and I feel rotten for him,” Kinnear said. “Nightmare. Poor kid was doing pretty good.”

Sherrod, who had been the Dynamo’s most pleasant surprise of the season, suffered the injury in the 12th minute Wednesday in the loss against D.C. United at RFK Stadium in a tackle with former Dynamo center back Bobby Boswell.

The 2014 MLS SuperDraft second round pick out of Memphis played in six games off the bench before starting the last three for the Dynamo.

He scored twice in his first career start against Real Salt Lake and then added the game-winning assist in his second start last Saturday against the Los Angeles Galaxy, drawing comparisons to Dynamo all-time leading scorer Brian Ching because of his exceptional and consistent work rate in defense and on the attack.

The Dynamo were pretty certain Sherrod’s injury was a torn ACL on Wednesday night, and an MRI on Thursday verified the injury.