Drexel (0-3) built a 37-31 lead in the first half, but it evaporated in the second. Je'Lon Hornbeak converted a pair of free throws that gave Monmouth (2-1) a 40-39 lead with 17:35 left.
Robinson knocked down 10 of his 17 shots from the field, including 3 of 7 from distance. Hornbeak finished with 17 points and Deon Jones added 13 rebounds for the Hawks, who shot 68 percent from the floor in the second half.
Monmouth heads to Orlando for the three games in the Advocare Invitational, beginning with Notre Dame Thanksgiving night, and Drexel heads to the Great Alaska Shootout.