Ahead at halftime 35-32, Cleveland State started the second half on a 21-7 run to break open the game and take a 56-39 lead with 13 minutes left to play. Mason, Kamczyc and Lee each hit 3-pointers during the run.
Cleveland State shot 57.7 percent (15 for 26) in the second half while holding the Redmen to 32.3 percent (10 for 31).
The Vikings outscored Rio Grande 12-2 on fast-break points in the second period.
Dominick Haynes led the Redmen (4-10) with 17 points.
SMU has signed a second player from Australia, 6-foot-11 forward Harry Froling, to a national letter of intent. The Mustangs previously signed guard Tom Wilson from Australia.
There's nothing to suggest the Jayhawks won't end up atop the Big 12 for a 13th season in a row. But what about a return to the Final Four?
Colorado State graduate transfer John Gillon has chosen Syracuse, giving the Orange a potential starter at point guard entering the 2016-17 season.