Stephon Marbury scored 28 points, Antonio Davis provided a spark in overtime, and the Knicks blew an 18-point lead before beating the Dallas Mavericks 117-115 last night for their fifth straight win.

Jamal Crawford added 25 points and Eddy Curry had 21 for the Knicks, who beat one of the NBA’s top teams for the second time in two nights and have won five in a row for the first time since January 30-February 8, 2004.

Davis had four points and three rebounds in overtime, while playing tough de fense on Dirk Nowitzki. New York led by at least eight points from midway through the first quarter until early in the fourth, but was forced to overtime after shooting only 7-of-21 (33%) in the final period.

Nowitzki had 32 points for the Mavericks, who had their three-game winning streak snapped and lost to the Knicks for the first time in eight games.

Curry converted a three-point play after grabbing an offensive rebound, giving the Knicks a 110-109 lead with 3:12 remaining in overtime. Davis’ follow pushed the lead to three before Nowitzki hit a 3-pointer to tie it for the final time.

Davis made two free throws with 1:27 to go to give the Knicks a 114-112, then he pressured Nowitzki into a tough miss on the other end. Crawford made three free throws from there.

Ahead by 18 points in the first half, the Knicks were still up by four until Devin Harris scored on a drive, forced Marbury into an offensive foul on the other end, and Jason Terry knocked down a jumper to tie it at 101.

After Marbury was called for traveling, Nowitzki’s jumper with 1 1/2 minutes gave Dallas its first lead since it was 7-6. Curry’s follow dunk tied it at 103, and Marbury answered Terry’s drive with two free throws to keep it tied with 27 seconds to play.

Nowitzki missed two chances after that, including a 3-pointer just before the buzzer.

Terry scored 20 points and Josh Howard had 18 for Dallas. Harris had 15 and Jerry Stackhouse 12 off the bench.

Playing one night after winning at Cleveland, the Knicks seized control minutes into the game. A 17-4 run turned a three-point deficit into a 21-11 lead, and New York led 35-21 at the end of the first period. Marbury and Curry each scored 10 points in the Knicks’ highest-scoring first quarter of the season.

Maurice Taylor’s basket pushed the lead to 40-22 less than a minute into the second quarter, and the Knicks were ahead 63-48 at halftime.