Dale Sullivan scored his second goal of the game to start the third period for Clarenville (1-0). Ryan Delaney and Matt Quinn also had a pair of goals for the Newfoundland club, while Andrew Sweetland chipped in as well.
Jason Churchill made 16 saves for the win.
Ryan Carter, Gerard Dicaire and Rick Cleaver supplied the offence for Fort St. John (1-1). Troy Hunt stopped six of 13 shots and took the loss for the Flyers. Clayton Pool stopped 17 of 19 shots in relief for the team from British Columbia.
Sullivan, Hulit twice, Delaney and Quinn all scored power-play goals in the first 9:06 of the third period to stake Clarenville to an 8-2 lead.
Cleaver then had a goal to make it 8-3 and Quinn's second of the night made it 9-3.
Also, Curtis Austring had back-to-back goals as the Bentley Generals downed the Kenora Thistles 5-2.
Scott Doucet and Dustin Sproat also scored for Bentley (2-0), while Dan Bakala made 19 saves for the Alberta club.
Ross Johnson and Matt Johnson had goals for Kenora (0-1), while Tyler Gordon stopped 32 shots for the team from Ontario.