Uni defeated the visiting Monticello Sages 1-0 to advance to the Class A sectional semifinals. Senior Sam Imlay scored in the 20th minute of the game. Sophomore Dan Lilly had the assist. Isaac Radnitizer recorded his ninth shutout of the season, making 16 saves. The Illineks will play Friday against the winner of today's St. Thomas More vs. Danville Schlarman quarterfinal match.