PHOENIX The SEC has been called the best conference in college football. With seven straight national championships under its belt, it's a tough argument to counter.

The Pac-12 might have it beat in terms of depth.

From the national championship contenders at the top to the rapidly-improving teams at the bottom, the Pac-12 may be the nation's deepest conference.

The Pac-12 has three undefeated teams Oregon, Stanford and UCLA and four in the Top 25.

But what has made the conference so strong this season is the improvement by Washington State, Utah and Colorado.

California, 1-4 in its first season under coach Sonny Dykes, is the only team in the conference with a losing record.

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