Thirteenth-seeded Summit hockey struck first in the first round of the state hockey tournament, but No. 20 Castle View's barrage of goals led to a 5-2 win.
Jaret Curran scored twice for the Sabercats, the first of which tied the game. After that, Castle View never trailed again.
The first period ended in a 2-2 tie but 24 seconds into the second period Jackson Szmul gave the Sabercats the lead for good.
Zach Carleton and Davis Emery scored the goals for Summit.
They'll meet Denver East in the second round of the tournament. It will be the first meeting between the two teams this year.
(16) Kent Denver 2, (17) Lewis-Palmer 0
Sam Choi got the Sun Devils on the board late in the first period and got an assist on Thomas Corbett's third-period goal.
With the win, Kent Denver advances to face top-seeded Valor Christian.
(9) Monarch 5, (24) Mullen 0
Sam Zis scored twice to lead the Coyotes to a first-round victory. They'll take on No. 8 Pine Creek on Saturday at 3 p.m.
(11) Cherry Creek 11, (22) Rampart 1
Gavin Berkey's hat trick highlighted a productive day on offense for the Bruins. They move on to face No. 6 Heritage in the second round.