Sequoia takes on top-seeded Harbor in quarterfinals, while The King's Academy travels to No. 2 Los Altos.
San Mateo and Half Moon Bay claim the top two spots in a division that has a few possible upset possibilities.
Gunn draws the No. 1 seed, while El Camino and Design Tech look to pull off quarterfinal upsets.
All 24 games will be played in the daylight.
Menlo and Sacred Heart Prep are one win each from a rubber game in their season series. Carlmont and Wilcox are poised to make noise.
Saint Francis will open with Serra as 21 teams from the PeninsulaPrepBaseball coverage area punch their tickets to the sectional tournament.
It's a big week as the CCS selection committee convenes on Monday and coaches will gather to pick their respective all-league teams and crown their outstanding players.
Bellarmine pounds out 22 hits in a thrashing of Carlmont.
