Christian Wood had 20 points and 11 rebounds and Goodluck Okonoboh had 12 points and 10 rebounds for the Runnin' Rebels (5-2). Jordan Cornish had 19 points and Cody Doolin and Dantley Walker had 12 apiece.
Saint Katherine (1-8), playing its second season of men's basketball, was led by D'Vaughn Mann and Jebari Robinson with 10 points each.
UNLV shot 62 percent, going 13 of 22 from 3-point range, and had a 56-31 rebounding advantage. Cornish and Walker each had four 3's and Doolin three. The Rebels were also 18 of 28 from the foul line while the Firebirds made 5 of 8.