Five Terps scored in double figures, led by Aaron Wiggins' 21 points.
Morsell is out after suffering a facial fracture against No. 16 Michigan on New Year's Eve.
The Terps have six players averaging at least nine points per game.
“He has a different energy about himself, a different confidence."
The sophomore had a career-high 32 points in the victory.
The Terps shot just 6-for-32 from three-point range.
Maryland is looking to bounce back from its first home loss of the season.
The Spartans prevented the Terps from clinching at least a share of the Big Ten regular-season title.
Morsell had shot just 3-of-11 from the field before his game-winner.
Maryland looks to bounce back from its loss at Ohio State.