And its creator, Gregg Nigl of Ohio, didn't even know he still had a perfect fit.
"It's really amazing, I didn't expect that at all. It was the fourth bracket I filled in. I almost didn't fill it out. It's a bit of a fly," Nigl said.
Nigl has exactly predicted the outcome of all 48 games so far in this year's online bracket challenge.
This is the only seizure that ever enters Sweet 16 unblemished in the five years when the NCAA began tracking online brackets from including our own site, ESPN, CBS, Yahoo, Fox and Sports Illustrated.
Nigl has Gonzaga win the tournament over Kentucky.
"Join the teams you like, go with them, you like the best, that's what I did," Nigl said.
We want to see if his winning strike continues with Thursday's game.
You can hear more about his predictions coming up on Good Morning America.