The Seattle Thunderbirds knocked off the top-ranked team in the Canadian Hockey League to advance to the Memorial Cup.
Alexander True scored the winner 12:36 into overtime as Seattle edged the Regina Pats 4-3, winning their best-of-seven Western Hockey League final in six games.
True's goal capped a Thunderbirds rally that saw them erase a 3-1 deficit.
Sami Moilanen, Sam Steel, Josh Mahura and Austin Wagner supplied the offence for the Pats.
Thunderbirds goaltender Carl Stankowski made 28 saves.