Upset special: Another wave of losses leaves NCAA committee with tough calls for No. 1 seeds

Another round of upsets capped a wild regular season, casting uncertainty over the coveted top seeds for the NCAA tournament. What's more, defending champion Kentucky is facing the very real chance of being left out of the 68-team field.

The selection committee is set to unveil its brackets Sunday evening. A year ago, the process was much clearer, with Kentucky, North Carolina and Syracuse as No. 1s.

Mike Bobinski, Xavier's athletic director, is the committee chairman. He considers as many as seven teams in the running for the top of the four regional brackets.

No. 1-ranked Gonzaga will be making its 15th straight NCAA appearance and is expected to land the top seed in the West. Beyond that, however, it's a bit of a mystery.