McLemore and Kool each added nine rebounds to contribute to the Broncos' 52-37 rebound advantage. Donald Lawson had 13 points and 11 rebounds for Western Michigan (1-1).
Virginia Commonwealth led 42-35 at halftime but struggled to score in the second half. The Broncos took the lead during an 11-0 run midway through the period.
Western Michigan outshot the Virginia Commonwealth 46.6 percent (27 of 58) to 30.7 percent (23 of 75).