Crystal Lake South made enough trips to the free-throw line Saturday night to stave off a late rally by Marengo's boys basketball team.
That Gators downed 23 of 38 shots from the stripe to pick up a 61-57 nonconference road win.
Senior Nick Geske scored a game-high 24 points on three 3-pointers, and junior Austin Rogers added 19 for South (11-14).
Junior Adam Rogutich and sophomore Weston Shepard scored 12 apiece to lead nine scorers for the Indians (10-17), which scored 21 fourth-quarter points.
Montini 66, Marian Central 56: At Lombard, Wyatt Lindell scored 15 points, going 7 for 7 from the foul line, and Derreck Caldez added 14 for the Hurricanes (3-25, 2-7) in their Suburban Christian Conference Blue Division loss against the Broncos (17-7, 8-2).
CL South 53, Dundee-Crown 50: At Carpentersville, Austin Rogers scored 23 points to lead the Gators (10-14 overall, 4-7 Fox Valley Conference Valley Division) to an upset over the Chargers (17-6, 8-3).
Nick Geske added 14 and Alex Bartusch scored 11 for South. J.T. Beasley led D-C with 15 points, Dylan Kissack had 14 and Brandon Rodriguez had 13.
Alden-Hebron 54, Faith Lutheran 38: At Hebron, Bryce Lalor scored 18 points to lead the Giants (11-15) past the Saints (7-20) in their nonconference game. Cody Nelson added 11 points and Chip McKay had nine as the Giants celebrated their Senior Night with a victory.
IHSHL Quarterfinals: At Crystal Lake, Crystal Lake South won Game 3 in the North Central Division quarterfinal series, 5-3, over Highland Park to advance to the semifinals.
Shane Gustafson had a goal and an assist for the Gators (23-6-1).
• Chris Burrows, Tom Clegg and Joe Stevenson contributed to this report.