Jayson Tatum drives against Denver’s Nikola Jokic during Boston’s 108-102 win Friday night at TD Garden. Michael Dwyer/Associated Press

BOSTON — Jayson Tatum had 24 points, Marcus Smart added 22 points, five steals and two crucial free throws, and the Celtics held on to beat the Denver Nuggets 108-102 on Friday night for Boston’s seventh straight victory.

Robert Williams added 15 points and 16 rebounds to help Boston extend its longest winning streak of the season. Derrick White had 15 points, six rebounds and two assists in his debut with Celtics after being acquired from San Antonio in a trade-deadline deal.

Boston spoiled another big night for Nikola Jokic, who got his 71st career triple-double with 23 points, 16 rebounds and 11 assists. Aaron Gordon finished with 17 points.

Denver led by as many as 11 in the first quarter and held a nine-point edge at the half. But the Celtics outscored the Nuggets 57-42 over the final 24 minutes.

The Celtics closed the gap in the third, capping a 15-2 run with a layup by Smart to take a 69-65 lead. But the Nuggets closed the quarter on a 14-7 run and led 79-76 going into the fourth.

A wild sequence that started on the defensive end by a Williams block ended with an alley-oop to him that put the Celtics in front 91-90 with just over seven minutes to play.

A technical foul during an ensuing timeout on JaMychal Green pushed the lead to 92-90 following a free throw by Tatum. Denver tied it at 95 on a 3 by Jokic and nudged in front on a free throw by Will Barton.

But Boston got the lead back on another dunk by Williams and a free throw by Brown. Jokic got to the foul line but converted on only one of his attempts, and White then got free underneath and dropped in a layup.

Barton missed a 3 with just over a minute left. Smart was fouled on the other end and hit two free throws to push the lead to 102-97 with 55.1 seconds left.

White made his presence felt almost instantly with his new team. He checked in at the 4:35 mark of the first quarter, and less than a minute later scooped up a deflection by Smart, led a fast break and lobbed a pass to Brown for an easy layup.

When he wasn’t scoring, White always seemed to find his way to the ball, whether it was tipping in a miss or just keeping the ball alive in the half court.

TIP-INS

Nuggets: Jokic has eight triple-doubles in his last 14 games and is just seven triple-doubles behind Wilt Chamberlain (78) for fifth on the NBA all-time list.

Celtics: Smart had three steals in the first quarter and four in the first half. … Boston scored 54 points in the paint.