The Aztecs, unbeaten in seven games, turned a 23-19 lead into a 32-19 cushion during the latter stages of the first half. They went on to pick up their 17th straight non-conference home victory.
Malcolm Thomas added 12 points and the Aztecs blocked a season-high 10 shots.
St. Mary's was led by Rob Jones with 17 points. The Gaels won their first six of the season, but have now lost two straight.
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