The Jaspers (5-2, 1-0 Metro Atlantic Athletic Conference) broke an early six-all tie with a 13-0 run fueled by 3-pointers from RaShawn Stores and Shane Richards, coasting to a 37-26 lead at halftime. They opened the second half with a 9-0 surge sparked by Alvarado with a three-point play to grab their largest lead of 20.
Marist (0-9, 0-2) crawled back to cut the deficit to six on a pair of Chavaughn Lewis free throws, but couldn't pull closer as Manhattan sank eight of their last 10 from the foul line.
Alvarado was 4 of 8 from the field and hit 10 of his 12 free throws. Rhamel Brown had 12 points and six rebounds for the Jaspers.
Lewis paced the Red Foxes with 23 points on 7-of-17 shooting.
Maryland point guard Melo Trimble has withdrawn from the NBA draft and will return to College Park for his junior season.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.