USC and Oregon are still on a collision course for Nov. 3. Yet, both divisions appear to be much improved. And what's more interesting is the hierarchy shift in both the North and South that took place last week. Oregon State and Washington could be the top challengers in the North while Arizona State and UCLA look like the best bets to topple USC in the South. UCLA and Oregon State have must-win games this weekend, while Washington's season could be on the line in Eugene.

Week 5 of the 2012 college football season is in the books and plenty of coaches saw the temperature on their seat increase by a few degrees. Kentucky's Joker Phillips and Boston College's Frank Spaziani continue to hold down the top two spots in the rankings. One new coach makes an appearance in this week's top 20 (Ellis Johnson), while Texas Tech's Tommy Tuberville drops out after beating Iowa State to move to 4-0 this season.

The 2012 season is turning into one of the best fans have seen out West in years and it has a chance to get even better. Oregon State and Arizona State made huge statements last week, but both have huge road tests this weekend that will prove if they belong in conference contention. Otherwise, all eyes across the college football world should be on the Pac-12 this Thursday evening.

Pac-12's Top Storylines to Watch in Week 5:

The Pac-12 is a really good football league. And while Arizona State and Cal barely missed huge upset wins on the road in the SEC and Big Ten respectively, the league is still nipping at the heels of the SEC for national supremacy.

Week 3 of the 2012 college football season is in the books and plenty of coaches saw the temperature on their seat increase by a few degrees. Kentucky's Joker Phillips easily ranks as the No. 1 coach on the hot seat after a disappointing loss to Western Kentucky. SEC foe Tennessee lost to Florida on Saturday, which only adds to the pressure under coach Derek Dooley.

After two weeks of action, it has become clear that the Pac-12 is much better than originally believed. Week 2 featured landmark victories over major powers from the Big Ten (Nebraska, Wisconsin, Illinois) and Big 12 (Oklahoma State) as well as victories over the ACC (Duke) and Big East (Syracuse). However, the same couldn't be said for Pac-12 contender wanna-be's Washington and Utah — both of whom now need to pick themselves off the mat after crushing defeats.

Week 2 of the 2012 college football season is in the books and plenty of coaches saw the temperature on their seat increase by a few degrees. Kentucky's Joker Phillips and Boston College's Frank Spaziani won last Saturday, but both coaches rank as the top two on the hot seat going into Week 3. Auburn's Gene Chizik and Iowa's Kirk Ferentz are ranked for the first time in 2012, while Arkansas' John L. Smith makes an appearance after the Hogs' stunning overtime home loss to Louisiana-Monroe.

The story in the Pac-12, at least until Nov. 3, will be attempting to compare Oregon and USC. These were arguably two of the best looking teams in the nation last weekend and, if anything, fans in Eugene should actually be more confident in their quarterback situation. While Chip Kelly and Lane Kiffin are seemingly on a collision course, four new head coaches attempted to kickstart their new tenures. Arizona State and UCLA obliged with force while Arizona slipped past Toledo in overtime, only further muddling the mix of teams behind the Men of Troy in the South.

The Pac-12 is in the best position to challenge the SEC's strangle-hold on college football. Both USC and Oregon are ranked in the top five and have eyes not only on the Pac-12 title, but also the BCS National Championship. The Trojans are the nation's No. 1 team but the Ducks are the three-time defending conference champs. Something has to give. Additionally, this league added four new head coaches that will bring electric new offenses to a conference that already gives defensive coordinators nightmares.

The Pac-12 is one of the nation's top conferences for offense, so it should be no surprise that six of the top 10 players in Athlon's top 50 for 2012 check in on that side of the ball. USC's Matt Barkley is the frontrunner to win the Heisman, while receivers Robert Woods, Keenan Allen, Marqise Lee and Marquess Wilson are all All-American candidates. While the defense doesn't have as many players in the top 10, Utah's Star Lotulelei and USC's T.J. McDonald rank among the top six players.