“It’s big for us,” Pierce said. “This is a gut-check type of a win, a ‘look yourself in the mirror’ type of game. ... I know we are capable of playing against quality opponents.”
Boston led 84-70 on Pierce’s 3-pointer with just under 10 minutes left, but the Thunder cut it to six, 93-87, thanks in part to a 3-pointer from Durant and a dunk from Ibaka. It was 101-89 when Westbrook made a pair of free throws and Durant hit a 3-pointer, then they each added a pair of free throws to cut the deficit to three points.
But Durant’s 3-point attempt was a little short, then Garnett’s free throws gave Boston back a cushion. Jason Terry hit a 3-pointer with 37 seconds left to clinch it.
Kendrick Perkins had five points and nine rebounds in his second game in Boston since he was traded to Oklahoma City by the team he helped win the 2008 NBA championship. Jeff Green, the only remaining player on the Celtics from that deal, scored 17 points off the bench.
Pierce matched his season-high in points, taking advantage of Durant after he picked up three fouls early in the second quarter.
“He’s got a lot of tricks,” said Perkins, his former teammate. “That’s the reason he’s been scoring the ball like he has for years. Got a lot of tricks, man. He did a great job tonight of just playing smart.
The Celtics trailed by seven points after one quarter but took a 48-45 lead into the half. They quickly expanded it to eight thanks to three straight baskets from Pierce, including a 3-pointer that made it 55-47 just 1:18 into the third quarter.
It got as high as nine points before the Thunder came within two, 66-64 with Garnett and Pierce on the bench. But Garnett came back into the game and Boston scored the next 11 points before Kevin Martin made a free throw with 2 seconds left in the third to make it 77-65.
Pierce hit a 3 to make it 84-70 with 9:52 to play, Boston’s biggest lead of the game.