NEW HAVEN 63, SOUTH LAKE 29: Romeo Weems (12 points, 11 rebounds) and Ashton Sherrell (11 points, 11 rebounds, four steals) each finished with a double-double to lead the Rockets (3-1).
Eric Williams Jr. led all scorers with 16 points and Tavares Oliver tossed in 10 points.
South Lake got 10 points from Jamall Dees.
New Haven will meet Michigan Collegiate at 6 p.m. Thursday for the championship.
MICHIGAN COLLEGIATE 58, MOUNT CLEMENS 44: Jordan Davis finished with 17 points and 14 rebounds, while Jaylen Branch (nine rebounds) and Antonio Simely (11 rebounds) netted 13 points apiece to lead the Cougars (5-0). Reggie Lawrence totaled six assists and three steals.
Mount Clemens got 14 points from Delano Williams and 11 out of Jordan Cotton.