Crunch time is known as "I.T. Time" in Boston, and Isaiah Thomas delivered again when it mattered most - with a major assist from Kelly Olynyk.
Now, they're headed to the Eastern Conference Finals.
Thomas finished with a team-high 29 points and 12 assists, and hit several big shots during that game-changing run.
As good as Thomas was, Olynyk was the biggest X-factor in the game. He contributed a huge 26 points off the bench, most of which came in the fourth quarter.
Al Horford also finished with 15 points, six rebounds and five assists for the Celtics.
Washington did respond to Boston's run with a 7-0 run to climb back into it, but they were never able to get over the hump. Bradley Beal (who finished with a game-high 38 points) came up with a four-point play to cut the deficit to four, yet they were never able to get any closer.
John Wall added 18 points and 11 assists for the Wizards, but missed his final 10 shots.
Boston will take on the Cleveland Cavaliers in the Eastern Conference Finals. Game 1 is set for Wednesday at 8:30 pm ET on TNT.Back to the Boston Celtics Newsfeed