John Wall had 18 points and 15 assists, Markieff Morris scored 18 and Otto Porter Jr. contributed 15 as Washington won its ninth straight game at Madison Square Garden.
Emmanuel Mudiay's layup pulled New York within 107-97 at the 2:26 mark and Damyean Dotson's 3-pointer made it 107-100 with 1:34 to go. In between, New York's Courtney Lee -- playing his first game of the season -- missed an open layup.
Mudiay's two free throws got the Knicks within five with 1:02 remaining and, after Morris missed a three, Noah Vonleh's layup cut the Wizards lead to three. But Wall's 3-pointer with 11 seconds left made it 110-104.
New York outrebounded Washington 55-38.
The Knicks led by nine at halftime but started the third quarter 1 for 12 from field.
Washington pulled within 63-62 on Porter's 3-pointer with 7:44 left in the quarter. Porter soon hit another three to give the Wizards their first lead, 67-65, since it was 2-0.
Beal's 3-pointer and his conversion of an alley-oop from Wall made it 72-65. New York coach David Fizdale called time as the Washington run reached 20-4.
Wall's driving layup pushed the lead to 80-69 at the 3:33 mark, but New York rallied to within 86-80 by the end of the quarter.
The Knicks closed the first half with an 11-3 run.
New York shot 53.3 percent from the field (23 of 44) compared to 44.4 percent for Washington (20 of 45).
--Field Level Media
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)