PETALUMA — Sometimes the heavy favorite does its expected duty.

On Saturday, the top-seeded St. Vincent-Petaluma football team  did just that in a 46-0 shutout over No. 8 Calistoga.

The Wildcats finished their season 5-6, while St. Vincent (8-3) moved on to host St. Bernard-Eureka, which edged Tomales 17-14 on Friday.

The Mustangs outgained Calistoga 360-107 in total offensive yardage on the way to taking a 40-0 halftime lead.

St. Vincent running back Kris Farinha carried 11 times for 123 yards and a 70-yard touchdown run. Quarterback Josh Wheeless completed 5 of 7 passes for 118 yards and two touchdown passes to wide receiver Nick Eastham for 9 and 29 yards, respectively.

Connor Ciocci scored on a 1-yard run and a 61-yard fumble return, Jeff Kesler scored on a 9-yard run, and Spencer Willin — normally an offensive lineman —  scored from 1 yard out.

For Calistoga, Joshua Monroy carried 18 times for 46 yards.

But for the Wildcats, the big blow came early in the contest when starting quarterback Lucas Fernandez had to leave the game because of a sprained ankle.

Fernandez was trying to cut upfield before a Mustang defender tackled him from behind and landed awkwardly on his left ankle. Fernandez was assisted off the field and relieved for the rest of the game by Jose Sanchez.

“His loss really hurt,” Calistoga head coach Mike Ervin said. “It happened so early, which is the saddest part.”

Ervin also felt for his senior class, which has been with him since taking over a what had become a rudderless program after the 2005 season.

“If they bust their butt and do what they are supposed to do, good things can happen,” Ervin said. “I’ve been with these seniors for all four years; 90 percent of them gave me everything they had. It’s that other 10 percent that was a little questionable.”

Defensively for Calistoga, Lincoln Fox recorded two tackles for lost yardage and shared a quarterback sack with Rafael Torres-Feiner, who also shared in a tackle for lost yardage. Junior varsity call-up Gonzalo Ayala also shared in a tackle for a loss. Monroy also added 1.5 quarterback sacks.

The loss ended an otherwise inconsistent season for Calistoga, which was 2-5 at one point before winning three straight games to end the regular season and eke out a postseason berth.

When asked what needs to be done to alleviate those inconsistencies, Ervin said “It’s called doing what you are supposed to do. It’s about coming to practice and being where you are supposed to be when someone tells you to be there.”