The Windsor Spitfires are one win away from advancing to the Western Conference championship game.
The Spits defeated the Firebirds 2-1 in Flint on Tuesday night.
Windsor's Anthony Cristoforo scored early in the first period.
In the second period, AJ Spellacy found the back of the net to take a 2-0 lead.
Early in the third period, Flint scored their first goal of the night, but were unable to tie the game up.
If Windsor wins Game 4 on Thursday night, they will advance to the third round and will play either the Kitchener Rangers, or the Soo Greyhounds.
The Spits fell to the Rangers in Round 2 of the OHL Playoffs last season in overtime of Game 7.