Bracket Math: Arizona No. 1

The 15-0 Arizona Wildcats come in No. 1 in Joe Lunardi's Bracket Math S-curve. Casey Sapio/USA TODAY Sports

Welcome back to one of the most popular Bracketology features here at ESPN Insider. "Bracket Math" provides an up-to-the-minute assessment of the entire Division I men's basketball landscape. You'll know who we'd put in the bracket -- and why -- at any given point of the season.

Bracket Math appears regularly throughout conference season, and you can find it daily during the frenzy that is Championship Week. We know you want bracket updates as often as possible, but when that's not practical, Bracket Math will always tell you where your team stands in the NCAA tournament selection process.

This edition of Bracket Math includes games through Sunday, Jan. 5. Rankings reflect an up-to-date S-curve from yours truly, posing as one hypothetical member of the NCAA men's basketball committee.

The bracket

This is where teams would fall if Selection Sunday were today. Remember, the S-curve flows left to right, then right to left, then back again as you read down the chart.