You’d hope that young legs wouldn’t be bothered by a back-to-back at the beginning of the season.

But the Mavericks’ 25-and-under members seemed to run into a brick wall after a spectacular first half, fading badly after the break during as the Jazz roared to a 113-94 rout.

Darren Collison, O.J. Mayo, Brandan Wright, Rodrigue Beaubois and Jae Crowder combined for 49 of the Mavs’ 63 points in the first half, which they finished with an eight-point lead. They were 18-of-28 from the floor at that point, including 8-of-11 from 3-point range.

That quintet combined for a grand total of 11 points in the second half.

Mayo, Crowder and Beaubois all went scoreless in the second half. Beaubois didn’t even attempt a shot after the break, while Mayo and Crowder combined to misfire eight times. Collison wasn’t much better, scoring four points on 1-of-6 shooting in the second half.

As a whole, the Mavs shot 54.2 percent from the floor in the first half and 20.9 percent in the second half.

A few more notes from the ugly end of the Mavs’ 1-1 road trip.

1. Kidd you not: Collison finished with 17 points for the second consecutive night despite fading so badly in the second half. It was expected that he’d provide a scoring punch that the Mavs were missing from their point guard last season. To put his back-to-back 17-point games in perspective: Predecessor Jason Kidd’s high point total last season was 15.

2. Wright a bright spot: In his first two starts for the Mavs, Wright produced 29 points on 12-of-13 shooting and blocked five shots. He’s given coach Rick Carlisle reason to keep Wright in the rotation even when 7-footers Dirk Nowitzki and Chris Kaman return to a crowded frontcourt. But rebounding remains a weakness for Wright, who has eight boards in 46 minutes so far this season. He had only three rebounds in 26 minutes against the Jazz, who dominated the glass by a 61-40 margin.

3. Welcome to the NBA: Rookies Jared Cunningham and Bernard James made their NBA debuts against the Jazz. They didn’t exactly have the kind of performances that they’ll end up telling their grandkids about. Second-round center James had eight points and six assists, but the Mavs were outscored by 27 during his 16 minutes on the floor. First-round guard Cunningham went scoreless on 0-of-3 shooting in six garbage-time minutes, recording one steal and one turnover.