Javon Greene had 13 points and eight rebounds for George Mason (8-6, 4-4 Atlantic 10 Conference). Josh Oduro added 12 points.
Saint Joseph's scored 24 first-half points, a season low for the team.
Taylor Funk had 21 points for the Hawks (1-12, 0-7), whose losing streak reached four games. Jordan Hall added 15 points, seven rebounds and seven assists.
George Mason defeated Saint Joseph's 87-85 last Wednesday.
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