Maia scored nine of his points in the first half as Brown (6-2) took an 11-point lead into halftime. American (3-5) went on a 12-4 run to pull within one, 58-57 with 8:07 remaining. Brown answered with McGonagill's 3-pointer, which capped a 7-1 run, stretching the Bears' lead to 65-58.
A pair of free throws by Charlie Jones pulled American within two points, 69-67 with 2:01 to play, but the Eagles finished 0 of 4 from the floor.
John Schoof had a game-high 15 points for American, leading four in double figures.
Purdue coach Matt Painter says players haven't used the fifth-year graduate transfer rule for its true intent.
The dust has settled after players made their NBA draft decisions. Which college teams won? Which lost? Well, Villanova is pretty happy. USC, meanwhile, might not be as thrilled.
The 2017 recruiting class is short on point guards, with Trevon Duval leading only eight prospects from the ESPN 60 who are still available.