The Rebels (20-7, 8-5 Mountain West) have won 20 games for a fifth straight season. They atoned for an earlier 15-point loss to the Rams (18-8, 8-4), a team they may be fighting with for a spot in the NCAA tournament.
UNLV gained on Colorado State in the conference standings, pulling within a half-game of the Rams for third place.
Tre'Von Willis, who missed the first meeting against CSU with a sore right knee, finished with nine points and eight assists. He sealed the win by hitting two free throws with 15.6 seconds remaining.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.