Los Alamos' and Del Norte both entered Wednesday's contest with 3-0 District 2-5A marks.
Los Alamos, however, was able to beat the Knights in three games — 25-16, 25-15 and 25-21.
"I think it was really important to show we deserve to be first in the district," Noelle Gallegos said. "Only one team was going to come away undefeated in the district, and I think we wanted it."
All three games were close at some point, but the 'Toppers were able to finish every game strong.
The first game was tied, 6-6. Two kills by Brianna Montaño and back-to-back aces by Elizabeth Anaya helped Los Alamos pull away in the game.
Los Alamos fell behind early in the second game, 7-6. Los Alamos then scored 15 of the next 17 points to cruise to a victory. Samantha Melton served seven consecutive points, including two aces, during that stretch.
In the third set, Sierra Foley got a kill for a side out and then served three aces and eight points to help Los Alamos jump out to an 11-3 lead. Del Norte fought back and cut the Hilltoppers' lead to two, 19-17.
Los Alamos, however, was able to close out the game and grab hold of sole possession of the district lead.