The Vipers have grabbed a commanding three nothing series lead over Strathroy by grounding the Rockets 4-3 last night at the Vollmer Centre.
Cale Allen scored the game winning goal for LaSalle with just over five minutes remaining.
Brett Primeau paced the attack with a pair of goals while Daniel Beaudoin added the other.
The Vipers out shot the Rockets 47-42.
The Vipers will be looking for the sweep in the series when they head to Strathroy for game four tomorrow night.