Updated

The Pac-12 has been fighting with the SEC for years to be considered the nation's toughest conference. That might finally be the case this season — though to the Pac-12's detriment.

In the aftermath of No. 6 Stanford's 26-20 victory over No. 2 Oregon on Thursday night, the league is left without an undefeated team and once again searching for a way to crack the BCS championship game.

Stanford and Oregon have been among the nation's best programs the past four seasons. But the depth of the conference is finally starting to catch up, turning the league into what the SEC has been for so many years: a two-month fight that nobody survives unscathed.