The Mariners topped the visiting Bulldogs, 25-20, 25-27, 25-19, 25-17, on Thursday.
Shalene Peek led Nikiski with 16 kills, Hillary Bogard had 24 assists, Danielle Bower recorded 11 digs, Kassi Johnson added 10 digs and Tasha Thompson picked up nine kills.
"We played, I thought, one of our better defensive games," said Nikiski coach Sharon Thompson. "It's the same thing we've been having to do, we just need to learn to finish the game and finish the match.
"If we can keep improving our defense, we'll keep winning, because defense wins games."
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