Let the madness begin.

Here's what we're watching:

12:15 p.m. ET, CBS: No. 14 Valparaiso Crusaders vs. No. 3 Michigan State Spartans, Midwest regional, Auburn Hills, Mich.

12:40 p.m. ET, TruTV: No. 11 Bucknell Bison vs. No. 6 Butler Bulldogs, East regional, Lexington, Ky.

1:40 p.m. ET, TBS: No. 9 Wichita State Shockers vs. No. 8Pittsburgh Panthers, West regional, Salt Lake City, Utah

2:10 p.m. ET, TNT: No. 13 New Mexico State Aggies vs. No. 4Saint Louis Billikens, Midwest regional, San Jose, Calif.

Approx. 2:40 p.m. ET, CBS: (No. 11 Middle Tennessee Blue Raiders/No. 11 St. Mary's Gaels) vs. No. 6 Memphis Tigers, Midwest regional, Auburn Hills, Mich.

Approx. 3:10 p.m. ET, TruTV: No. 14 Davidson Wildcats vs. No. 3 Marquette Golden Eagles, East regional, Lexington, Ky.

Approx. 4:10 p.m. ET, TBS: No. 16 Southern Jaguars vs. No. 1Gonzaga Bulldogs, West regional, Salt Lake City, Utah

Approx. 4:40 p.m. ET, TNT: No. 12 Oregon Ducks vs. No. 5 Oklahoma State Cowboys, Midwest regional, San Jose, Calif.