Last year quite a few people made it through the first full day of the NCAA Tournament with perfect brackets intact.

This year? Not so much.

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Before UAB upset Iowa State in the second result Thursday, 97.3 percent of entries in CBS Sports' bracket challenge were perfect. After UAB's win, 3 percent were. Then another No. 14 seed, Georgia State, upset No. 3 seed Baylor, and by 4 p.m. Eastern Time only 0.27 percent of brackets in CBS' contest were unblemished.

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By 6 p.m., after UCLA beat SMU, 0.089 percent of CBS brackets and 0.12 on ESPN's site were perfect. By 7, after only seven games had been completed, CBS had a mere 0.0573 percent pristine brackets.