The Bobcats (11-6, 2-2 Mid-American Conference) trailed 7-2 early before gaining control. They built their lead to as much as 17 points early in the second half.
Whittington hit 5-of-9 3-point attempts, while Tillman was 8-for-11 from the field. The Bobcats shot 49 percent.
Leon Williams had seven points, 10 rebounds and four assists in an all-around game for the Bobcats.
Al Fisher had 15 points, Haminn Quaintance 12 points and 12 rebounds and Mike Scott 11 points for the Golden Flashes (14-4, 3-1). They trailed 36-25 at the break, losing their early five-point lead when Ohio countered with a 14-2 run.