TORONTO, Dec. 2 (Ticker) --
Riding the best road winning streak in club history, the Toronto Raptors came home and endured the worst second half in club history.
The Raptors were held to a team record low of 25 points in the second half by the surging Boston Celtics, who had their best defensive effort of the season in an 85-69 victory.
Antoine Walker scored 17 points and Kenny Anderson added 14 for Boston, which has won a season-high four in a row and snapped Toronto's season-high four-game run.
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Paul Pierce takes Vince Carter to the hole in win over Toronto.
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"It was a very good win, impressive defensively," Celtics coach Jim O'Brien said. "We played tough."
The Raptors won Saturday in Atlanta to extend their road winning streak to five games, matching the team record. However, the last-second win may have taken something out of them as they never led and were awful in the second half.
"We didn't play hard for 48 minutes and it cost us," said Raptors forward Morris Peterson, who made 3-of-9 shots. "We were breaking down on defense and missing shots. We were out of sync. They played a good zone. We could say we were tired, but they played yesterday as well. So that's no excuse."
After closing to 46-44 at halftime, Toronto shot just 22 percent (10-of-46) from the field in the second half. The Raptors fell behind 73-60 after three quarters and trailed by 20 points in the final period.
"We had a lot of inside shots and didn't convert," Raptors coach Lenny Wilkens said. "A lot of missed shots and they took advantage of it. It's disappointing, we worked hard to get back into the game. We had a two-point difference. In the second half, we had nothing. We were bad. We were menatally exhausted."
Toronto scored just 25 points in the second half, three worse than what it had at New York on March 15 of last season. It also managed just nine points in the fourth quarter, breaking the previous club mark of 10 at Washington on February 24 of last season.
"You can't do anything but shake your head at that one, a day when nothing went right," said Toronto forward Antonio Davis, who was just 2-of-8 from the field.
All-Star Vince Carter scored 17 points on just 6-of-21 shooting. No Toronto player made half his shots and the Raptors were just 4-of-25 from 3-point range.
"This time we were better offensively and more consistent on the defensive end," Celtics forward Paul Pierce said. "In the past, we have taken quarters off, but today we didn't. Everyone knows what Vince can do and we tried to get him off his game. He wasn't able to get really started, and that worked to our advantage."
Eric Williams scored 13 points and fellow reserve Vitaly Potapenko added 11 and 10 rebounds for the Celtics, helping to cover for Pierce.
Pierce, who scored a career-high 48 points in an overtime win at New Jersey on Saturday, managed just nine points on 4-of-16 shooting.
"It's very important to have a strong effort from our bench, especially when our two main guys, Antoine and Paul, aren't doing as well," Williams said.
Walker had a 3-pointer to start a 9-3 run that gave Boston a 27-14 lead with 3:26 left in the first quarter. Toronto moved within 31-23 after one period and closed within a bucket at halftime as Tracy Murray scored 11 points in the second quarter.
The Raptors still were within 61-58 on a jumper by Keon Clark with 3:24 remaining in the third quarter. But Potapenko scored inside and added two free throws before a 3-pointer by Erick Strickland gave Boston a 10-point lead with two minutes to go.
"We worked really hard defensively," Strickland said. "We weren't shooting the ball very well, so we picked it up in other ways. I think the guys are starting to get confidence in each other, and that really showed a lot on this road trip."
Williams made a 3-pointer that gave the Celtics a 73-60 lead heading into the final period. Walker's layup capped a 20-5 burst and pushed the advantage to 83-63 with 4:46 to go.
Boston shot under 40 percent (29-of-73) but won in Toronto for the first time since November 2, 1999.