Chris Boucher set a personal high with 30 points, but the Toronto Raptors lost 132-125 to the Celtics in Boston on Thursday.
This match marked the end of the first half of the season for the Raptors (17-19).
The Montrealer led his team with five three-pointers, but Boston beat Toronto for the third time on three occasions.
Jayson Tatum and Jaylen Brown provided 27 and 21 points for the Celtics, who recorded a fourth straight win.
For the Raptors, Norman Powell scored 25 points and Terence Davis 22.
Lowry set a career high with 19 assists, in addition to recording 14 points. He thus equaled a record set by José Calderon.
The Raptors were once again without Pascal Siakam, Fred VanVleet, OG Anunoby, Patrick McCaw and Malachi Flynn, all in connection with the NBA’s COVID protocol.
Siakam was missing a third game in a row, as was coach Nick Nurse and several of his assistants, also due to league rules about the pandemic.
The other players were missing a second game in a row.
Siakam and VanVleet lead the Raptors with 20.1 points per game. Anunoby is 5th at 13.8.
Sergio Scariolo led the team for a third time.
Thursday’s matches are the last of the first half of the season.
The All-Star Game takes place in Atlanta on Sunday.