Nemanja Mikic had 20 points and Dwayne Smith posted a double-double as George Washington used a 17-0 second-half spurt to defeat Massachusetts 59-51 on Sunday.
The Colonials (13-12, 6-5 Atlantic 10 Conference), who trailed by 12 early in the game, were still down 47-41 with 5:27 to go.
Aaron Ware hit two free throws with 4:48 left to spark the run, which gave George Washington a 58-47 lead with 38 seconds left.
The Minutemen (13-10, 5-5) made only one field goal in the game's final 9 minutes and were held scoreless for 5:06 en route to their third straight loss.
Mikic hit six 3-pointers, while Smith had 14 points and 10 rebounds.
UMass shot 30.4 percent from the field (14 of 46) while George Washington shot 35.3 percent (18 of 51).
Gary Correia led UMass with 15 points. Anthony Gurley, who had been averaging 19.9 points per game, was held to seven.
