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The Kraken, clinging to a wild-card slot, have now lost five of their last seven games.
The Bulldogs are leaving for the Pac-12 Conference next season and made sure to go out winners.
Gonzaga (29-3) will play Santa Clara (26-7) in the title game.
Seattle has lost two in a row and four of its past six.
Lynden girls, LC boys and girls, and Lummi boys all have a shot at state basketball titles
Lynden and Nooksack Valley boys suffer losses in Round of 12
Seattle defenseman Vince Dunn had a goal and an assist.
Cal Raleigh and pitcher Gabe Speier will look to lead the U.S. team to a second title.
Kaapo Kakko also scored for the Kraken, and Joey Daccord was superb in net with 35 saves.
It’s the fourth straight year Saint Mary’s has won at least a share of the conference title.