Updated Saturday, November 3, 2012 at 03:09 PM
SNOQUALMIE — Nick Mitchell doesn't get discouraged easily.
The junior Mount Si quarterback missed on seven straight pass attempts in the first quarter Friday night and then suddenly became unstoppable.
Mitchell finished with 273 yards and five touchdowns in a 52-7 win over Auburn Mountainview. Second-ranked Mount Si advances to the first round of the Class 3A playoffs next week.
Mitchell, who has 23 touchdown passes this season, also ran for a score for the Wildcats (9-1).
"It took a while, but I just settled in the second quarter," Mitchell said. "You have to hand it to them, but I just kept going, kept going after it, and finally started connecting and found a rhythm. After that we just never slowed down."
Mitchell completed nine in a row in a second quarter that included four touchdown passes as Mount Si stretched a 3-0 cushion into a 31-0 lead at halftime.
Three of his touchdown passes went to senior Trent Riley, who has a school-record 22 career touchdown receptions. Riley caught nine passes for 107 yards and also had an interception.
"We just have really good chemistry," Mitchell said. "It started out this summer when we went out and threw every single day. Ever since then we've just kept working at it every day this season to get ourselves better."
Mitchell thinks Mount Si can go a long way in the playoffs.
"I think the sky is the limit," Mitchell said. "We just keep getting better."
Mitchell also had touchdown passes to Mclain Griffin and Jimbo Davis, and Bailey Takacs had a scoring run.
Mount Si led only 3-0 in the first quarter when Cameron Van Winkle, who is headed to the University of Washington, nailed a 24-yard field goal.
Riley's 9-yard TD reception in the third quarter that put the Wildcats up 45-0. Nahaku Kekoa then returned the kickoff 94 yards for Auburn Mountainview's only TD.
Mount Si has scored 402 points this season and allowed only 84.
Keenan Mcvein had 97 yards on 15 carries for Mount Si. Rockey Domenic passed for 78 yards.
Auburn Mountainview, the No. 3 seed out of the South Puget Sound League with a 2-3 conference record, finished with a 3-7 overall record.