Henry Bethel led the Otters with 16 points, hitting four 3's and making 6-of-8 free throws. Josh Sternberg added 7 and Ryan Hirst had 6 points.
Jack Boos had a game high 21 to lead Rocori. The Spartans won their sixth straight game.
Fergus Falls (6-13) goes to Bemidji on Saturday afternoon.