WASHINGTON — Kyrie Irving scored Boston’s last 12 points, including back-to-back 3-pointers in the final 40 seconds of overtime to outduel John Wall in a point-guard showdown, and the Celtics extended their winning streak to seven games with a 130-125 victory over the Washington Wizards on Wednesday night.

With his team serenaded by “Let’s go, Celtics!” chants on the road, Irving even got his own “M-V-P!” chorus late, finishing with 38 points and seven assists. Marcus Morris added 27 points and nine rebounds for Boston, which played without Al Horford, Gordon Hayward and Jaylen Brown – its No. 4-6 leading scorers.

No matter how many players they were missing, and no matter how disjointed their offense looked for a half, the Celtics had too many interchangeable parts to get beaten by an opponent that has been inconsistent all season. Wall returned after missing a game because of an aching left heel to pour in 34 points with 13 assists. But his seven points in OT weren’t enough to keep pace with fellow All-Star Irving.

The Wizards led 123-122 when Irving made a 3 with just under 40 seconds to go, and after Wall tied it at 125, Irving hit another shot from beyond the arc – this one from 31 feet. That gave Boston the lead for good, because Bradley Beal (22 points; zero in OT) and Wall then missed 3s.

This sure was a close one: The clubs kept trading the lead and neither was ahead by more than three points over the final 10 minutes of regulation. Up 113-110, Boston opted to foul Beal on purpose with 13 seconds left, but that backfired, because after he made the first free throw, he missed the second – but grabbed the rebound and put it in for the tie.

Irving blew by Beal at the other end but missed a layup right before the buzzer, sending the game to OT. And then he really took over.

Down by nine at halftime, the Celtics turned things around in a hurry – although not before that deficit grew to 57-46 early in the third quarter.

Soon enough, Boston put together a 10-0 spurt, capped by a pair of free throws by Marcus Smart, to take the lead at 65-62 midway through the quarter. When Morris made a 3 and, after Washington turned over its inbounds pass, Terry Rozier sank another to cap a 27-9 run, suddenly the Celtics held their biggest lead at 73-66.

The lopsided third quarter ended with Boston ahead 84-77.

But the Wizards opened the fourth with an 8-0 run despite resting Beal and Wall, and when Markieff Morris – Marcus’ twin – hit a 3, it gave the Wizards an 85-84 lead.

• Horford sat for the third consecutive game and is expected to miss at least a few more because of an injured left knee.

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