- Joe Lunardi, Senior Writer, ESPN.com
Welcome back to the expanded edition of Joe Lunardi's Rundown, which takes you deeper into Bracketology. Bracketology provides a snapshot of how the bracket looks on a specific day, but through the use of Lunardi's extensive database of previous seasons, tournament odds tell you how the bracket is likely to look come Selection Sunday.
Top line report
There are no changes since Monday's bracket in terms of the four No. 1 seeds. Syracuse, Kentucky, Ohio State and Missouri all escaped varying degrees of challenges earlier in the week.
Resident ESPN Bracketologist Joe Lunardi has the latest look at the NCAA tournament field. While Syracuse, Kentucky and Ohio State are securing their spots on the bracket's top line, the fourth spot remains up for grabs among a bevy of contenders.