By Madison Williams Arizona, UCLA, USC and Colorado all earn a single round bye as the top four seeds. View the original article to see embedded media. It’s officially conference-tournament week as teams across the country earn one last chance to prove themselves before March Madness begins. Last Wednesday, Arizona (28-3, 18-2) clinched the Pac-12 regular season title and earned the No. 1 seed in the conference. Then, following Saturday’s UCLA vs. USC game, the bracket for the Pac-12 tournament was complete. With the 75-68 win over USC, UCLA (23-6, 15-5) earned the No. 2 spot and USC (25-6, 14…