At this point, any upset not only threatens a team's standing in the RivalsHigh 100, it also alters their playoff path and, sometimes, change seasons altogether. Add in the intensity of existing heated rivalries, cook to a simmer and you have a recipe for massive prep football action, as we saw across the country during Week 9.
• Mobile (Ala.) McGill-Toolen 38, No. 13 Daphne (Ala.) 27: Daphne was the ballyhooed, ranked squad entering this game, but McGill-Toolen was the team that got the best of this historic rivalry, with McGill scoring the final 27 points, snapping Daphne's impressive 23-game winning streak in the process.
• No. 93 Everett (Mass) 35, Boston College (Mass.) High 21: Boston College High has a tough team, deep roster and battle-tested schedule. It doesn't have the sheer talent of Everett, however, a factor which became abundantly clear as the Crimson Tide's victory on Saturday wore on, with Everett coming through with all the big plays down the stretch in a key, 14-point victory in the Bay State.
• No. 64 Cibolo (Texas) Steele 34, Converse (Texas) Judson 20: The Rockets made this San Antonio-area face off more than interesting, but in the end it was the consistent brilliance of Steele quarterback Tommy Armstrong which won out the day, with Armstrong passing for two touchdowns and running for two other scores in the Knights' win in a huge Thursday night district clash.
• Ensworth (Tenn.) 37, No. 74 Brentwood (Tenn.) Academy 17: Ensworth controlled this upset from the outset, holding a 10-point halftime lead and then watching dynamic Ensworth running back Corn Elder put his personal stamp on the Tigers' victory with a touchdown in the passing game, one of four touchdowns he scored on the night to pace Ensworth to a potential season-turning win.
• No. 51 Del Oro (Calif.) 28, Granite Bay (Calif.) 24: The Golden Eagles needed everything they could pull out of their arsenal in this narrow win thanks to another impressive performance by Del Oro quarterback Bobby Heatherington, who threw touchdowns to three different receivers en route to improving to 35-1 all-time as the school's starting quarterback.
• No. 63 Lakewood (Ohio) St. Edward 42, No. 43 Cincinnati (Ohio) Archbishop Moeller 27: For the record, this is the most convincing way to possibly bounce back after a pair of tough losses to nationally ranked teams; by beating another ranked team. St. Edward shook off rattling setbacks in the Bronx and in Cincinnati to put things back in place against Moeller, which appeared to be a national title sleeper just weeks ago. The Eagles clinched a playoff berth with the win, while Moeller suddenly faces a steep climb ahead if it is to salvage its season ... pressures that St. Edward is all too familiar with.
Want more on the best stories in high school sports? Visit RivalsHigh or connect with Prep Rally on Facebook and follow us on Twitter. For more highlights from around the nation and live streaming video of top games, check out Rivals High TV.