The Terps surrendered four runs in the fifth inning of the second game to fall behind for good.
A bases-clearing error in the seventh inning lifted the Terps to a series win.
The Terps managed just one run in 14 innings of play Saturday.
The Terps cruised in the first game and walked off the Spartans in the second contest.
Nelson drove in three runs to lead the way for the Wildcats.
The Terps lost their third straight game by at least eight runs.
It was the Terps' second loss to the Sun Devils in the tournament.
The Terps earned their second consecutive win for the first time this season.
Infielder Taylor Okada went 4-for-5 with three RBI.