Marks' points came on 5 field goals, 2 three pointers and 8 of 9 free throws during the game.
Nahki Taylor added 9. Groveport Madison fell to 0-1 overall while Olentangy improved their record to 4-4.
Player of the game
Olentangy will travel to on Friday Jan. 18 at 4:30pm to play Westerville South.