The Hawks beat the Knicks 109-108 in Atlanta, their second straight one-point triumph which gave them the advantage in their best-of-seven Eastern Conference Series.
The Toronto Raptors also thrived at home, pulling away late in a 126-104 victory over the Cleveland Cavaliers that cut the deficit in their series to 2-1.
The Hawks produced a fine collective effort, especially on the defensive end, to thwart the third-seeded Knicks’ comeback bid.
With plenty of time after McCollum’s go-ahead basket, the Knicks were unable to get a shot off as the Hawks pressured Jalen Brunson into a poor pass intended for Josh Hart and Jonathan Kuminga lunged in for a game-clinching steal.
“Picture perfect,” McCollum said of the defensive display in the waning seconds. “When it was time to get a stop our guys dug deep and they did what it takes to win in these types of environments.”
Jalen Johnson scored 24 points, pulled down 10 rebounds and handed out eight assists for the Hawks. McCollum added 23 points and Kuminga scored 21 off the bench.
The Hawks had led by as many as 18 in the first half but the Knicks took a 108-105 lead on a three-point play by Brunson, who was fouled by McCollum on a drive to the basket and converted the free throw with 1:03 to play.
Johnson pulled the Hawks back within one with a putback layup and, after misses by Hart and Brunson, McCollum came through.
OG Anunoby scored 29 points and grabbed nine rebounds for the Knicks.
Brunson scored 26 points and Karl-Anthony Towns scored 21 points with 17 rebounds for New York, who will try to turn the tables in game four in Atlanta on Saturday.
In Toronto, Scottie Barnes and RJ Barrett scored 33 points apiece, and rookie Collin Murray-Boyles added 22 off the bench for the Raptors.
Barnes handed out 11 assists and the Raptors, who took a two-point lead into the fourth quarter, stormed home.
They connected on eight of nine three-point attempts in the final frame, out-scoring the Cavaliers 43-23.
James Harden scored 18 points and the Cavs got 15 from Donovan Mitchell, Evan Mobley and Max Strus.
In the Western Conference, the Minnesota Timberwolves got past the Denver Nuggets 113-96 in game three for a 2-1 lead in that opening-round series. (AFP)
