After weeks of anticipation and speculation, the bracket-filling finally can begin Sunday as the 68-team fields for the NCAA men's and women's basketball tournaments are revealed. "Selection Sunday" will unveil which teams made the March Madness tournaments (and which "bubble" teams were left disappointed) that will unfold over the course of four regionals to will determine the Final Four national semifinals.

Selection Sunday is when the 68-team field for the NCAA Men's Basketball Tournament is announced. Thirty-one teams will automatically make the field after winning their conference championship. The remaining 37 teams will receive at-large bids. Selection Sunday at 6 p.m. on Sunday.

NCAA men’s and women’s basketball tournaments tip off in the week ahead, and it’s time to start making preparations for filling out your bracket. Step one takes place this weekend with NCAA Selection Sunday,