McMahon hit 6 of 8 3-pointers as WCU was 14 of 39 from distance.
Xavier Cork added 10 points and 10 rebounds and Tyler Harris had 10 points for Western Carolina (3-1).
Ryan Jolly had 19 points for the Lions. Orry Clements-Owens added 13 points, and Jordan Foote had 11 rebounds.
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