The actor was singled out on the NCAA's website on Thursday for "scoring better than all the rest" of the celebrities who submitted brackets for this year's tournament. According to the NCAA, Parsons accurately chose 29 first-round games and 15 second-round games, earning him a score of 59 points.
"That would put him in a tie for 180th place out of millions of brackets in our Bracket Challenge Game," the site stated.
By Thursday, the 46-year-old "Big Bang" star guessed 44 out of 48 games correctly — a nearly 92 percent accuracy rate.
"Parsons predicted all three of the 12-5 upsets correctly, choosing Liberty to beat Mississippi State, Murray State to beat Marquette, and Oregon to beat Wisconsin," the NCAA said.
However, Parson's bracket has since taken a hit, especially after Michigan State defeated top overall seed Duke 68-67 on Sunday night. The actor had chosen Duke and North Carolina to face off in the national championship on April 8. He had North Carolina winning it all, but the No. 1 seed was "slayed" Friday night by the Auburn Tigers — the first time a No. 5 seed has overcome a No. 1 seed in roughly eight years, according to the NCAA.
During an appearance on the Dan Patrick Show last week, Parsons joked about his bracket's initial success.
"This is embarrassing ... I'm never real informed on college basketball as it is. I find it overwhelming to try and pretend to keep up throughout the season," Parsons said, though he admitted he "some sort of vague notion."
He then explained how he chose his "brilliant picks" this year.
"I used to Google whatever [Barack] Obama was picking and look from there," Parsons joked.
But after admitting he couldn't find Obama's, Parsons said he turned to a Yahoo Sports article written by Henry Bushnell.
"He had ranked in some article who had the best chances, just going on down, like a numbered list," Parsons explained. "I started going down, whoever he says his No. 1 I'm going to take them to the finals. Whoever he says is No. 2 I'm going to go and they're going to be a competitor."
Parsons said he did that for about three-quarters of the bracket and then got "bored," so everything he hadn't picked up until that point he simply chose an upset.
"That's the science behind my bracket-busting lead," Parsons said.
According to the NCAA, there's no longer a perfect bracket.
"The briefly famous “center road" bracket, which had correctly predicted the first 49 games of March Madness, suffered its first loss in the second game of the Sweet 16 when 3-seed Purdue beat 2-seed Tennessee in overtime," the NCAA confirmed in a blog post on Sunday.