Lucky Jones had 10 points, seven rebounds and three steals for the Colonials (6-4), who have won three straight games.
After trailing by one point, Robert Morris went on a 14-0 run that was capped by Velton Jones' three-point play to give it a 25-12 lead with 6:36 left in the first half.
Williams knocked down a jumper with 7:33 left to play to give Robert Morris an 18-point advantage -- its largest of the game.
Ramon Mercado was the only Hampton player to score in double figures with 13 points, making three 3-pointers.
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point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.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.
|South Carolina State||12-4||1||19-15|
|North Carolina Central||7-9||6||13-19|
|North Carolina A&T||7-9||6||10-22|