Brett Dalton scored the winner with 43 seconds left in regulation.
Maroons head coach Bill Bowler said it was a tough loss.
“It was tough losing the way we did… so late in the game, but we have some players that can play better,” he said. “It’s a long series.”
Michael Verboom scored s shorthanded goal for Chatham, and he added an assist on a goal by Brennan Feasey.
Game 2 is set for tomorrow in Strathroy.
Puck drops at 7:30 p.m.
Tune in to 99.1 or online at ckxsfm.com, they will be broadcasting the game LIVE.