Down to 16 teams, NCAA Tournament still has a lot to watch

Kentucky head coach John Calipari shouts instructions to his team during the second half of an NCAA tournament college basketball game in Louisville, Ky., Saturday, March 21, 2015. Kentucky won 64-51. (AP Photo/Timothy D. Easley)

It's the Sweet 16 - the second week of the NCAA Tournament - and that means bragging rights for college basketball programs.

Check the cover of media guides or banners adorning arenas. They always start with Sweet 16 appearances. No bragging about the first weekend. Playing this week means you had two good wins and you are just two wins from the Final Four.

The story of the tournament has been Kentucky's pursuit of a perfect season. Everyone's playing in that shadow. The Wildcats improved to 36-0 - the best start to a season for any team - and they're trying for 40-0.