The best and worst of college football was on display Saturday from thrilling upsets (Stanford over Oregon, Baylor over Kansas State), newfound hope in the national title race (Notre Dame, Alabama and Georgia) and unexpected results (Baylor has a defense?).

Bragging rights in Los Angeles and a spot in the Pac-12 Championship will be on the line when USC and UCLA meet on Saturday afternoon. This season has not gone according to plan for the Trojans, as most expected USC to contend for the national title and for quarterback Matt Barkley to rank among the top Heisman contenders.

The Oregon-USC rematch Pac-12 championship game has felt like a foregone conclusion for much of the 2012 calendar year. However, it's very possible both teams could lose this weekend — and that would essentially put Stanford and UCLA into the championship game. What a twist that would be in Week 12, right? Those are two of the best games of the year in the Pac-12 and are two of the marquee showdowns nationally this weekend. Sit back and enjoy.

Pac-12's Top Storylines to Watch in Week 12:

College football's Week 12 schedule is highlighted by two huge battles in the Pac-12. Stanford visits Oregon in a game that likely will decide the South Division champion, while USC makes the short trip to UCLA for the game of the year in the South.  

What a last few weeks it should be out West. UCLA and USC will square off this weekend with a trip to the Pac-12 championship game on the line. Oregon now has to face possibly its toughest two opponents of the season with Stanford and Oregon State to finish the year. Jeff Tedford is hanging by a thread in Berkeley. And all chaos is breaking out in Pullman.

The race in the Pac-12 South continues to entertain. Arizona's loss to UCLA was costly, both in the standings and on the injury report. USC's loss to Oregon didn't end their title hopes as the two L.A. schools are now headed on a collision course for Nov. 17. But both need to take care of business this weekend against overmatched opponents to ensure next weekend's game sends the winner to Eugene in December. Otherwise, all eyes should be pointed northward to Palo Alto, where the Beavers come to town, and Seattle, where Utah is fighting for a bowl game.

The Oregon Ducks cleared their first big hurdle with style and grace. Defensively, USC was able to move the football plenty, but simply couldn't stop what could be the best offense in the nation. However, due to a monster performance across town from UCLA over Arizona, USC sits back in the driver's seat for the Pac-12 South Division championship. And a trip to Eugene could be just as entertaining as this weekend's offensive showcase in Los Angeles.

College football’s Week 10 slate is highlighted by the Alabama-LSU clash in Baton Rouge and Oregon’s visit to USC. The Trojans have played their way out of the national title race with two losses in league play, but this is still a very talented team that is capable of winning the rest of its games.

Week 10 Predictions

It's here! November 3 has been a day circled by many West coast football fans since the season ended last January. And had Arizona not gone and screwed everything up, this Oregon-USC showdown would still carry national title implications for both teams. Instead, there's a national title hanging in the balance for just one team. The Oregon Ducks. All eyes will be focused on The Coliseum, but Pac-12 fans have a full holiday menu this Saturday. There will be plenty of tricks and treats for some (Utah? Washington? Oregon State?) and freakish ghouls for others (Cal? Arizona State?

The Pac-12 South was expected to be a one-team race in the preseason. USC was a heavy favorite in August but already has two losses in Pac-12 play. The Trojans, UCLA and Arizona State all have two losses within the conference and Arizona isn't far behind with a 2-3 record. 

Arizona, Arizona State, UCLA or USC: Which Team Wins the Pac-12 South?