El Toro and Mission Viejo also have first-round home games, in Division 1. Villa Park has a first-round home game in Division 2, and Tustin is at home in the first round in Division 3.
This is the first season of the Open division in the CIF State Championships. Teams have to meet standards, like having qualified for the Regionals in three of the past four years, to be selected to the Open Division. There seven teams in the Open Division in the CIF Northern California Regiaonsl and seven in the Open Division in the CIF Southern California Regionals.
Regionals champions in six divisions meet in the CIF State Championships in Sacramento, March 22 and 23.
Many teams that lost in CIF-Southern Section semifinals were selected to the Regionals, including Mission Viejo, Dana Hills, Ocean View and Tesoro.
A first-round game featuring two Orange County teams playing each other is rare, but it is happening inn Division 3 on Wednesday when Ocean View plays at Tustin.
First round games are Wednesday in all divisons expect for the Open Division, in which first-round games are Friday.
Regionals brackets for boys and girls basketball are here.