Jordan Lauf gave Toledo a 78-77 lead after splitting a pair of free throws with 1:38 left in extra time. Mario Matasovic slammed home a dunk and then had a layup after an Austin Richie steal to seal it for Western Michigan.
The Broncos led 67-61 with 1:27 left in regulation. Julius Brown scored five points and Jonathan Williams scored two to tie at 68. Tava made two free throws to regain the lead, but Brown responded to tie at 70 and force overtime.
Brown drained five 3-pointers and finished with 31 points for Toledo (10-7, 2-2).
It was a rematch of last season's MAC championship, which the Broncos won 98-77.