Jalen Brunson made two free throws with 12.7 seconds to play, lifting the New York Knicks to a 91-90 win over the host Boston Celtics on Wednesday and a 2-0 lead in their Eastern Conference semifinal series. Boston had a chance to recover in the final seconds, but Mikal Bridges knocked the ball away from Jayson Tatum and New York took possession. Josh Hart had a game-high 23 points for New York, which trailed by 20 points in the third quarter and by 16 in the fourth. The Knicks received 21 points and 17 rebounds from Karl-Anthony Towns. Bridges put up 14 points — all in the fourth quarter. Brunson, finished with 17 points and a game-high seven assists, said of the decisive foul shots, “I got up there, heard the noise and then I just tried to block everything out. And then I made two.” Knicks coach Tom Thibodeau said, “We started slowly, got in a big hole, dug out way out and then guys made a lot of tough plays. (Our players) were at their best when their best was needed down the stretch.” Derrick White and Jaylen Brown each scored 20 points for the Celtics. “They made the necessary plays to win,” Boston coach Joe Mazzulla said of the Knicks. “We put ourselves in position to do that and we just didn’t make the plays (down the stretch). “You just take a look at it and figure out where you have to be better and put a full 48 minutes together. Have an understanding that it’s going to be difficult, but that’s why we do what we do. Figure out where we have to get better and do that. We got to get on the road and we got to find a way to win.” Game 3 of the best-of-seven series will be played Saturday in New York. New York took its first lead on a Brunson layup that made it 87-86 with 1:59 to play. Another Brunson layup capped a 21-2 run that stretched New York’s lead to three points before two Tatum free throws pulled the Celtics within one point with 44.9 seconds left. Boston took a 90-89 lead on a Tatum dunk with 18.5 seconds to go, but Brunson knocked down two free throws on the ensuing possession. Tatum, who averaged 26.8 points per game during the regular season, was held to 13 points, but he grabbed 14 rebounds. Boston also received eight points off the bench from Kristaps Porzingis, who didn’t play in the second half of Game 1 because of an illness. Porzingis played 14 minutes in Game 2. The Celtics played without Sam Hauser, who sustained an ankle injury in the third quarter of Game 1. Boston led 24-13 after one quarter on Wednesday and 50-41 at halftime. The Celtics were up by 16 before the Knicks finished the second quarter on an 11-4 run. Tatum was held to two points in the first half. The Celtics extended their lead to 70-50 on a Porzingis dunk with 4:05 remaining in the third, but New York scored the final eight points in the quarter to cut Boston’s lead to 73-61 entering the final frame. Boston was again foiled by poor 3-point shooting. The Celtics were 10 of 40 (25 percent) from long range on Wednesday after going 15 of 60 (25 percent) in their overtime loss on Monday, when they also squandered a 20-point lead. “The way the game goes now, you can make up ground a lot quicker with the way teams shoot threes,” Thibodeau said. “For the writers around us, they always think every lead is safe, but it’s not. Everything does matter.”