If you’ve had some trouble picking the upsets, you’re not alone. According to NCAA.com, less than 20 fans are taking a perfect bracket into this weekend’s Round of 32.

Daniel Wilco of NCAA.com is keeping track of the brackets entered at ESPN, Yahoo, CBS, Sports Illustrated, Fox and the site’s own Bracket Challenge Game. Tens of millions of brackets were entered prior to the start of Round 1. Wilco notes that by the end of Thursday, the number of perfect brackets was down to about 60,000. After Friday, the total is down to 16 (10 at ESPN, three at Yahoo, two at NCAA.com and one at CBS).

Wilco’s tracking comes with some surprises along the way. On Friday night, a bracket which had correctly picked the first 28 games left the “perfect” club when No. 1-seed North Carolina beat No. 16-seed Iona.

For the sweet 16 with a perfect bracket, the first test of the day will be No. 3-seed LSU vs. No. 6-seed Maryland, scheduled for a noon ET tip.