FAIRFAX, Va. -- Marc Sonnen connected on seven 3-pointers and had 21 points to lead Northern Iowa to an 82-77 overtime victory over George Mason, snapping Patriots' 14-game home winning streak.
Tuttle finished with 18 points, going 12-for-14 from the foul line.
George Mason (6-4) got 20 points from Sherrod Wright, but was undone by some costly miscues and inconsistent play from point guards Bryon Allen and Corey Edwards. They combined for 21 points but also had eight turnovers between them.
George Mason trailed 80-77 before Allen committed a turnover with three seconds remaining in overtime. The Patriots' Johnny Williams was forced to immediately foul Tuttle, who hit his final two free throws to provide the final margin.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.