Brandon Glover set up both of the Nationals goals as London shut out the Listowel Cyclones 2-0 in Game 4 of the Sutherland Cup Semifinal series.
Brenden Trottier opened the scoring midway through the third and Carson Brookshaw scored on an empty Cyclones' net with just 90 seconds left in the game.
Brock Baier held the Nationals scoreless over the first two periods, stopping 21 shots.
The first goal was scored when the puck flipped into the air and was batted into the net by Trottier. The second goal came on an empty net.
Cameron Zanussi made 18 saves to earn the shut out for London.
The Nationals now lead the series 3-1. Game 5 is tomorrow night in Listowel.
Advanced ticket sales are on sale at Listowel Memorial Arena between 7pm and 8:30pm Thursday night.