Tre Campbell hit a 3-pointer midway through the second half to extend Georgetown's lead to 46-25. UMES responded with a 12-2 run, led by Devin Martin's five points, to pull within 48-37. But Campbell made four straight free throws to spark 10-2 spurt for a 19-point lead.
Bradley Hayes had 11 points and nine rebounds for Georgetown (3-3). Smith-Rivera has 1,480 career points and moved into 16th place on the Hoyas' all-time list.
Smith-Rivera scored 17 points in the first half, including all five of his 3-pointers, as Georgetown held a 38-20 lead at the break. He hit back-to-back 3s in the final two minutes to spark the Hoyas' 8-0 spurt to close the half.