MADISON, WI (WTAQ) - Four Number One seeds lost Saturday night in the boys’ state high school basketball regionals.

Sun Prairie was upset in Division One along with Waunakee in Division Two, Crandon in D-Four, and Wausaukee in Division Five.

All of the returning champions and AP Number Ones that played Saturday evening won their games.

A few schools were off, because they had wait for opponents who were behind in the brackets after being snowed out on Friday night.

Nine regional finals will be played Monday night. And then fields will be set for the boys’ sectionals that begin on Thursday.

36 of the 42 top-seeded teams are still alive, including all eight in Division 3.