you know, a big weekend in college basketball you start with more than 60 schools in each of the tournaments. really, it's about the final four this is like the mount everest of the sport's most beloved coaches, roy williams of north carolina is calling it quits after 33 years as a head coach in just hours, a weekend of college basketball drama is set to unfold. >> here's decker, another three! >> perimeter defender. score! >> reporter: the matchups, a mix of top teams and electric upstarts on the men's side, a texas-sized showdown between baylor and houston. while 11 seeded ucla, which has the most championships in men's college basketball history, takes on tournament goliath gonzaga. >> we got two more that we need to get done. taking it one game at a time. >> reporter: in the women's bracket, there are three top seeds. stanford, south carolina, and uconn, and a lone three seed, arizona, which is playing in its first final four behind other worldly play from senior guard air ari mcdonald >> what is going on in this tournament >> yeah, i've been having, like, an outer body experience i've been so, like, locked in, like dialed in. >> reporter: mcdonald's d