Marcus Smart had 28 points and 10 rebounds for the Celtics, who had a six-game winning streak come to a halt. Grant Williams added 17 points, and Derrick White had 15 points and eight assists. Boston was without Jayson Tatum (knee), Jaylen Brown (knee), Robert Williams III (knee) and Al Horford (personal).
Austin Reaves added 23 points and Gabe Vincent scored 15 on five 3-pointers for the Lakers. Rui Hachimura and Jaxson Hayes had 11 points apiece and Jarred Vanderbilt collected 14 rebounds.
Canada's only NBA team put the finishing touches to a remarkable 4-2 series upset that denied the Warriors a fourth championship in five years.
Anthony Davis and Russell Westbrook led the Lakers from 17 points down in the second half. Davis had 30 points, 10 rebounds and six assists, while Westbrook supplied 26 points, 10 assists and nine rebounds. Carmelo Anthony added 18 points.
The Grizzlies, who had nine players score in double figures, stretched their winning streak to three. They managed the record blowout despite the absence of their leading scorer, Ja Morant, who is sidelined due to a knee injury.
Klay Thompson chipped in with 21 points for the Warriors, who won their third straight overall and ninth in a row at home to maintain their No. 6 position in the Western Conference playoff race.
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