The artificial surface at Boonville, to where Saturday's matches were moved due to wet conditions at Moberly, didn't appear to help the Birds -- who went in averaging 4.36 goals per match. Marshall had only a 2-1 advantage over the Tigers (10-14) in shots on goal during the first half.
However, the Owls struck twice within a four-minute span midway through the second frame. Senior Ebert Alvarez set up sophomore Erik Moreņo for a drive inside the left goal post in the 19th minute and then converted a feed from junior Jon Najera by hitting close to the same spot.
Junior goalkeeper Jacob Phillips made five saves for his 11th shutout of the season.
Marshall (19-4) advanced into Tuesday's semifinal round, where it will take on Moberly -- which has won three previous meetings with the Owls, all by one-goal margins.
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