It's the eight straight win for the Griffons, who sit third in the MIAA standings with six games left before the conference tournament.
Jake Jones (5-2) pitched 5 2/3 innings of one-hit baseball in the start, striking out four Gorillas along the way.
The lone run came when David Chew led off the fourth with a triple. Jeremy Monty popped out to left, giving Chew the go-ahead to score.
PSU (15-26, 10-12) threatened with a runner on first and second in the seventh and final inning, but Dylan Koch snagged a Derek Hackney blooper to end the game.
Mason Queen struck out one and allowed one hit over the final 1 1/3 frames to record his third save.
Mark Spreckels (3-0) was as efficient in Game 2, keeping the Gorillas off the board until the eighth inning. By then, MWSU (23-14, 19-11) had built a six-run advantage.
The start was pulled with no outs in the eighth after being tagged with two runs. He gave up six hits and three walks while striking out a pair.
Hunter Weiss led the Griffons with three runs driven in, while Trevor LaHonta picked up two more RBI.