These weren't upsets in the classic sense. These were maulings by the lower seeds.

And as the Class 4A girls basketball tournament continues Friday with Sweet 16 action, be assured that surprise teams Mountain View and Windsor made a big impact by turning the House upside down.

That would be the House Region, where seventh-seeded Mountain View and No. 5 Windsor shook up things with convincing victories against higher seeds that made the region the only one of the four to not progress as expected.

Mountain View, the lowest remaining seed, hammered No. 2 Centaurus 41-27 and Windsor upended fourth-seeded Ralston Valley 53-33. While Windsor (14-10) faces a tall task Friday playing on the home floor of top overall seed Broomfield (23-1), Mountain View will aim to keep its improbable run intact against third-seeded Alamosa (20-4).

"We come from what I consider to be the toughest conference in 4A girls basketball," said Mountain View coach Ron Kainer, referring to the Northern League's West Division. "Week in and week out, you cannot take a night off, and I think this has prepared us well for the state tournament. But our upcoming game with Alamosa will be a tough assignment."

The Mountain Lions (16-9) have been getting solid post play from Sarah Carlson and standout performances from point guard Ashlyn Rhule. They will try to combat Alamosa's Kelsie Kruger, Katie Bussey and Crystal Loch, all of whom possess double-digit scoring averages.

The playing field appears level in the Hill Region, where the top four seeds advanced.

Top-seeded Golden lost guard Cassie Lambrecht to a torn anterior-cruciate ligament on Feb. 9 and undoubtedly will continue to miss her 23.7 points a game.

Lambrecht, a junior who transferred from Palmer, had her season cut short for the second consecutive year because of a knee injury. The Demons, though, have pushed forward and received 29 points from Tawny Drexler in a 76-60 win against Mesa Ridge in the second round.

"While we are a much different team without Cassie, we are still a very talented, balanced team," Demons coach Jeff Neal said.

"In the four games since Cassie's injury, we have averaged 73.5 points per game. Prior to her injury, we were averaging 74.5 points per game."

The Demons will host Fossil Ridge on Friday, with the winner advancing to face the winner of second-seeded Harrison's game against No. 3 Silver Creek. The latter should be a stellar matchup, pitting two of the top players in the state, Harrison's Paige Ricker and Silver Creek's Meghan Heimstra.

The four top seeds also advanced in the Piel Region, where top-seeded Sierra will play No.4 Pueblo East and second-seeded Berthoud will play defending champion and No. 3 Mullen.

Host Sierra (18-5), led by Jeneesa Jeffrey, has won eight in a row, while Berthoud has won 11 of 12. Mullen and Pueblo East each possess a four-game winning streak.

The Haave Region has a definite Western Slope League flavor with three of the four remaining teams hailing from the league. At the forefront is top-seeded Moffat County (22-2), which will play fifth-seeded Rifle (17-6). The Bears upset Evergreen 49-48 in the second round.

The teams met twice in the regular season, with Moffat County winning 60-45 on Jan. 6 and 65-55 on Jan. 27. Markie Workman scored 27 in the latter game for the Bulldogs.

Glenwood Springs, the second seed, takes on No. 3 Pueblo Central, the only non-WSL team left in the bracket. Pueblo Central's Rachel Espinoza's 23.7 scoring average matches Lambrecht for best in the classification, but she might have to outscore Glenwood Springs' Sharaya Selsor and Sam Ciani for the Wildcats to have a chance.

A Moffat County-Glenwood Springs regional final would be compelling, considering the teams split two games this season that were decided by a total of three points.