Knicks center Karl-Anthony Towns celebrates after New York rallied in the fourth quarter to beat the Boston Celtics in Game 2 of their second-round playoff series Wednesday at TD Garden. Charles Krupa/Associated Press

Mikal Bridges scored all of his 14 points in the fourth quarter before making his second straight game-clinching steal, and the New York Knicks overcame a 20-point deficit again to beat the Boston Celtics 91-90 on Wednesday night for a 2-0 lead in the Eastern Conference semifinals.

Jalen Brunson scored 17 points for New York and made two free throws with 12.7 seconds left for a 91-90 lead. Jayson Tatum then couldn’t get to the rim and Bridges moved in to bat the ball away and recover it.

Josh Hart scored 23 points and Karl-Anthony Towns finished with 21 points and 17 rebounds for the Knicks, who will host Game 3 on Saturday.

Jaylen Brown and Derrick White scored 20 points apiece for the Celtics, who were 10 for 40 from 3-point range after going 15 for 60 in Game 1.

Tatum was limited to 13 points on 5-for-19 shooting for the Celtics, who went more than eight minutes without a field goal in the fourth quarter.

Teams that win the first two games of a best-of-seven series on the road win the series 85.7% of the time. The Knicks took the opener when Bridges stole the ball away from Brown with a second left in overtime.

Boston’s Kristaps Porzingis didn’t start after sitting out the second half of Game 1 because of an illness. He came off the bench for just the fifth time in his NBA career and finished with eight points and four rebounds in 14 minutes.

All eyes were on the Celtics’ offense after they missed an NBA-record 45 3-pointers in their Game 1 loss. They went 24 for 54 from 2-point range Wednesday.

Despite their shooting struggles, the Celtics found some traction late in the third quarter, using a 16-6 run – keyed by their effort on the defensive end – to turn a 10-point lead into a 73-53 advantage late in the third.

It was 84-68 after Payton Pritchard’s 3-pointer with 8:40 to play, but the Celtics wouldn’t make another basket until Tatum’s driving dunk with 18.5 seconds remaining.

New York cut it to 86-82 on a floater by Hart before Towns’ three-point play made it 86-85. Tatum missed a jumper, and Brunson sank an 18-footer to put New York in front.

A jumper by Brown rolled off the rim on Boston’s next trip up the floor. Brunson then found a lane to the basket and dropped in a layup to make it 89-86.

Tatum connected on a pair of free throws, then got it back following a New York miss that rolled out of bounds with 24.2 seconds left. He pushed the ball into the frontcourt and drove easily past Mitchell Robinson for a dunk to put the Celtics back in front.

Brunson was fouled on the ensuing possession and connected on both free throws.