The LaSalle Vipers were blanked 5-0 in London in the Greater Ontario Junior Hockey League.
Zachary Springer made 16 saves to record the shutout for the Nationals, and Riley MacRae and Christian Polillo each scored twice.
Will Tragge made 13 saves in goal for the Vipers.
The Nationals improve to 13-1-0-1, while the Vipers fall to 6-8-0-1.