DALLAS — Even if Klay Thompson had been making shots with Stephen Curry sidelined by a leg injury, the other half of the Splash Brothers knew Golden State would have a hard time winning.

With Thompson not hitting, the Warriors got blown out in just their second loss of the season.

J.J. Barea scored 23 points in another big game filling in for injured point guard Deron Williams, and the Dallas Mavericks rolled to a 114-91 victory over a Golden State team missing the NBA’s leading scorer and reigning MVP.

“That’s 30 points and a lot of playmaking, so we’ve just got to collectively try and chip in,” said Thompson, who had 10 points while matching Draymond Green with 4-of-15 shooting, with Green scoring 11. “We had great looks. It was just one of those nights.”

Curry has a bruised lower left leg and might sit again Thursday at Houston. But the Warriors (29-2) still have the best 31-game start in NBA history — a game better than four teams — after their record 24-0 start.

“They were a little short-handed tonight. Might have made a little difference,” Dallas guard Devin Harris said. “The attention that he brings in shotmaking and the way the offense flows with him out there, obviously was a little bit different tonight.”

Zaza Pachulia had 14 points and 15 rebounds for the Mavericks, who won their fourth straight game without Williams. Dirk Nowitzki added 18 points and eight boards.

The Warriors looked out of sorts almost from the beginning with their sharpshooting star watching from the bench in jeans and a black sport coat.

Marreese Speights threw a pass into the first row in the first half, drawing a rebuke from Ian Clark, the intended target who led Golden State with 21 points.

The 23-point margin was Golden State’s worst defeat since a 31-point loss to Houston in 2013, according to STATS.