At Flush, Clay Center held Rock Creek to less than 10 points in three of the four quarters in a 38-25 win.
Clay Center led 8-3 after the first quarter and 20-7 going into the locker rooms at intermission.
The Mustangs had their best showing in the third quarter, cutting the lead to 24-17. Clay Center outscored the Mustangs 14-8 in the fourth quarter to end the game.
Rock Creek had no scorers in double figures.