Bairstow grabbed eight rebounds and Kendall Williams supplied 10 points and seven assists for the Lobos (21-5, 12-2 MWC), who won for the ninth time in 10 games.
Winston Shepard paced the Aztecs (23-3, 12-2) with 10 points with six rebounds.
San Diego State fell to 2-1 since its 20-game winning streak was broken Feb. 11 against Wyoming.
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