Bishop Gorman, Green Valley, Liberty and Silverado hosting first-round games. Arbor View and Palo Verde meet with a Mountain Region home playoff game on the line.
Rigo Carrasco scored twice for the top-seeded and defending state champion Wildcats in a 3-1 win. Desert Region No. 1 Bishop Gorman beat Desert Oasis to stay unbeaten.
Centennial needs a win over a Cimarron-Memorial team that is out of the playoff race to claim its first league title since 2002 and the No. 1 seed in the Northwest League.