At Danforth, Gavin Russell scored 14 of his game-high 20 points in the third quarter to spark the Cougars to victory.
Russell also grabbed 12 rebounds and added six steals for Katahdin of Stacyville. Wyatt Morse scored 13 points and T.J. Young posted 10 points.
East Grand was led by Kenneth Winiarski and Logan Crone with 9 points each. Phillip Farley added 8 points.
Katahdin 16 24 44 60
East Grand 14 22 27 33