There were nine ties, seven lead changes, and neither Manhattan (14-13, 7-11 MAAC) nor Fairfield (13-16, 7-11) led by more than 10 points.
The Stags built a nine-point second half, 55-46, with a 16-5 run that lasted six minutes. Over the next five minutes, Nelson would score seven of his 20 to bring the Jaspers to within five, 60-55, with 2:18 to play.
A Nelson 3-pointer after a Josh Roberts offensive rebound made it a four-point game with 1:38 to go.
Jose Perez stole the ball from Jesus Cruz at midcourt. After Cruz fouled him to make it 62-60 Fairfield with 1:20 to play, Perez then converted two free throws.
With the Jaspers down two with 15 seconds left, Roberts stole an inbounds pass at midcourt and found Nelson, who could not hit his ensuing jumper. Fairfield would make its next two free throws provide the winning margin.
Manhattan started the afternoon with 10 of the first 12 points. Six of those came on a pair of Marques Watson 3-pointers. Watson would hit another triple in the first half and scored all 11 of his points before halftime.
Nelson added eight rebounds and two steals to his 20 points. Perez finished with 13 points, four rebounds, and two assists. Roberts grabbed nine ‘boards and added four points.
TJ Long came off the bench to lead Fairfield with 14 points.
The final week of the regular season continues with Manhattan welcoming Saint Peter’s to Draddy Gymnasium on Tuesday at 7 p.m.