Kevin Seraphin added 18 points and Wall and Trevor Ariza each added 14 points for the Wizards, who picked up just their second win away from home this season. They entered a league-worst 1-16 on the road.
Wall also had 12 assists. Nene had seven points for Washington in his return to Denver, where he played for nearly 10 years before being sent to Washington last March as part of a three-team trade.
Lawson scored 29 points to lead the Nuggets, who lost at home for just the third time in 18 games. He had made 10 consecutive shots from the floor before Wall rejected his layup in the final moments.
Corey Brewer and Andre Miller each added 17 points for the Nuggets, whose home-winning streak ended at five games.
Beal hit a 3-pointer to tie it at 58 with 8:07 left in the third quarter, but Lawson began finding the range, scoring 10 straight points for the Nuggets, including a pair of 3-pointers, to help Denver go in front 68-64.
Lawson made all eight of his third-quarter shots from the floor, including four 3-pointers. He finished his torrid quarter with a breakaway dunk, and Denver took an 87-80 lead into the final period.
Washington, though, opened the fourth with a big run of its own, scoring 12 unanswered points, including 3-pointers Ariza and Crawford and went in front 92-87 with 9:36 left to play.
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The Nuggets closed to 100-97 on successive baskets by Miller and Lawson with 3:46 remaining. A putback by Seraphin put the Wizards up 108-104 with 28.9 seconds remaining. Miller answered with a layup, was fouled but couldn't convert the free throw.
Crawford was fouled by Kosta Koufos and made one of two free throws for a three-point Washington edge with 21.6 seconds left and Miller then scored on a layup with 13.6 seconds remaining.
The Nuggets fouled Beal with 8.6 seconds and he made one of two free throws for a 110-108 lead. Lawson drove the lane but his attempt for a tying layup in the final seconds was blocked by Wall, who added a pair of free throws with 2.7 seconds left to seal the victory.
JaVale McGee, who was acquired as part of the trade that sent Nene to Washington, followed a one-handed dunk off an alley-oop from Brewer with a putback dunk in the last 33.3 seconds of the second quarter, giving the Nuggets a 50-45 halftime lead.
NOTES: Washington's Crawford was back in action after missing four games because of a sore left ankle. He came off the bench and had 8 points in just over 17 minutes of play. ... Nuggets had won 24 in a row at the Pepsi Center when scoring 100 or more points before losing to the Wizards.
Press; By DENNIS GEORGATOS]
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