More movement on top line

Duke's loss Thursday night to Virginia hurts the Blue Devils' chance of obtaining a No. 1 seed. AP Photo/Steve Helber

This edition of Bracket Math includes games through Thursday, Feb. 28. Rankings reflect an up-to-date S-curve from yours truly, posing as one hypothetical member of the NCAA men's basketball committee.

Notes on the "new" math:

• What do the following 10 teams have in common? Arizona, Duke, Florida, Gonzaga, Indiana, Kansas, Louisville, Michigan, Miami (Fla.) and Syracuse. All have been No. 1 seeds at least once in our brackets since the middle of January. If that doesn't tell you we're in for the most wide-open NCAA tournament in years, I don't know what will.

What this tells me is that at least 10 teams have a realistic shot at a national championship, and that's not counting a handful of other legitimate contenders such as Georgetown, Michigan State and New Mexico. It's a truly unprecedented state of affairs.