The game wasn't decided until the final minute, when an apparent 23-yard touchdown catch by Baltimore's Breshad Perriman was overturned by replay. Perriman got his right foot down in the end zone, but his left foot was out of bounds.
Crowder scored Washington's first TD with a sensational run through the middle of the Baltimore punt return team in the second quarter.
The definitive momentum shift occurred minutes later. With the Redskins operating from near their own 3, Ravens linebacker C.J. Mosley intercepted a pass by Cousins at the 13, but lost control of the football while reaching for the end zone. The ball rolled out of bounds in the end zone for a touchback, and the Redskins subsequently moved 72 yards for a field goal and a 16-10 lead.
Playing in a stiff wind, neither team got much from its kicking game. Dustin Hopkins missed an extra point for Washington and came up short on a 56-yard field goal try.
Baltimore opted to try a fake field goal in the second quarter, and failed. Later, Koch got off a 36-yard punt that didn't rise more than 20 feet off the ground.
The Ravens have lost two in a row - both at home - after opening with three straight wins. All of their games have been decided by six points or fewer.
Crowder responded with the Redskins' first punt return for a touchdown since 2008. But the conversion attempt clanged off the left upright.
Copyright 2016 by The Associated Press