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.
Regan Kerr's first inning solo shot was one of just two hits for the Terps.
The Terps cruised in the first game and walked off the Spartans in the second contest.
The Terps' bats fell quiet in game one but roared to life in game two for a mercy-rule victory.
The Terps lost their third straight game by at least eight runs.
Taylor Okada drove in the game winning run in extra innings to salvage a 1-1 set against the Fighting Illini.