Al Horford came off the bench to score 26 points and grab nine rebounds as the visiting Boston Celtics extended their winning streak to nine games by beating the Memphis Grizzlies 117-103 Monday night.

Horford made six 3-pointers in the win, which gave Boston (56-19) six victories during its six-game road trip. The Celtics have won eight in a row on the road overall and are 32-7 record in road games this season.

Jayson Tatum added 25 points and 14 rebounds in the win. Boston’s Derrick White finished with 14 points and made three 3-pointers, the second of which set a franchise record for most made 3-pointers in a season (246).

Ja Morant scored a team-high 26 points for the Grizzlies, who received 20 points and 15 rebounds from Jaren Jackson. Santi Aldama tossed in 21 points.

Memphis (44-31) has lost six of its last seven games. The Grizzlies are 0-2 since they fired head coach Taylor Jenkins and named Tuomas Iisalo interim head coach.

Boston played without Jaylen Brown (knee) and Luke Kornet (illness). Brown is averaging 22.4 points per game and is the team’s No. 2 scorer.

Memphis led 32-25 after one quarter and stretched that lead to 11 points early in the second quarter, but Boston had a 66-61 advantage at halftime.

The Grizzlies scored the first 10 points of the second half to go in front 71-66, but Boston regained control with an 11-2 run that gave the Celtics an 80-75 lead with 6:10 left in the third. Boston had a 92-85 lead after three quarters.

The Celtics had their first double-digit lead after Horford made a 3-pointer with 9:13 to play. The Grizzlies failed to get closer than seven points the rest of the way.

The victory allowed Boston to split its two regular season games against Memphis. The Grizzlies won 127-121 in Boston on Dec. 7.