Arizona opened the NCAA tournament with a victory, exactly what a No. 1 seed is supposed to do.

The way it happened, with that jittery start and ease-off-the-gas-pedal finish, the Wildcats will likely hear those upset picks even more now.

Anxious early and a bit too comfortable late, top-seeded Arizona pulled out a 69-59 win over Weber State in the West Regional on Friday, a victory that's unlikely to change predictions that the Wildcats will lose in the next round.

"We are fortunate to advance and I know the next game will be a terrific game," Arizona coach Sean Miller said. "One of my hopes is, (having) one of these under our belts, we will be more ourselves and better on Sunday."

The first full day of the NCAA tournament was a wild one filled with upsets, and the bracket-busting trend continued early Friday, when Mercer, a No. 14 seed, knocked off mighty Duke.

Arizona (31-4) appeared to be next in line, falling into an 8-point hole in the opening 6 minutes.

Arizona closed in around Weber State (19-12), shutting down the Wildcats during two big first-half runs, seemingly putting the fairytale to bed.

Instead of running away, the Wildcats backed off, allowing Weber State to trim a 21-point lead down to nine in the closing minutes.

Arizona pulled out the victory, but it was merely solid, not great, particularly since the next game — against Gonzaga or Oklahoma State on Sunday — is the spot the Wildcats have been picked to go down.