Here is Joe Lunardi's latest Bracketology update. Check back Sunday night for another update in the Nation blog and then again on Monday for Lunardi's full bracket.

TOP SEEDS

East: Ohio State

Southwest: Kansas

Southeast: Pittsburgh

West: Duke

CONFERENCE BREAKDOWN

Big East (11)

ACC (6)

Big Ten (6)

Big 12 (6)

SEC (4)

Atlantic 10 (3)

Mountain West (3)

Pac-10 (3)

Colonial (2)

Horizon (2)

West Coast (2)

LAST BYES (avoid First Four games in Dayton)

Butler

Richmond

Michigan

Clemson

LAST FOUR IN

Michigan State

Boston College

Virginia Tech

Colorado

FIRST FOUR OUT

Alabama

Georgia

USC

Baylor

NEXT FOUR OUT

Washington State

Memphis

Nebraska

UTEP