We know how fun it is to pick a No. 15 seed over a No. 2 seed. Hey, it's March, so maybe it even makes sense to do it more than once. But that made us wonder: how do you know when you've overdone it and made too many upset picks?
Here's how, including a tip for those 15 vs. 2 games:
1. You pick a No. 16 seed over a No. 1 seed
Look, we know it's tempting. But 2018 was the first time this had EVER happened. Will there be a UMBC in the 2021 NCAA Tournament field? Maybe, but likely not.
UMBC's historic 20-point upset of Virginia in Charlotte, North Carolina, was the first time a No. 16 seed had beaten a No. 1 seed since the tournament expanded to 64 teams in 1985.
Before the Retrievers pulled off what was once deemed impossible, only 15 games in the 1/16 matchup had been decided by less than 10 points. There hadn't been a game decided by one possession since 1996, before today's college players were alive.
UMBC aside, the other three No. 16 seeds in 2018 didn't have nearly the same luck, losing by an average of 20.3 points.
In 2019, the four No. 1 seeds won by an average of 22.8 points in the first round and all four won by at least 15 points.
Sure, it'd be great to tell your friends that you predicted the next UMBC. Heck, we wouldn't blame you if you put it as a bullet point on your resume. But we we're warning you. A No. 16 seed beating a No. 1 seed for the second time in three NCAA tournaments seems extremely unlikely.
2. You pick more than 10 double-digit seeds to win in the first round or more than five in the second round
...and more than two to win in the Sweet 16. None of those things have ever happened since the NCAA tournament expanded to 64 teams. On average, about 6.1 double-digit seeds win in the first round, 2.2 in the second round and 0.5 in the Sweet 16.
In 2019, eight double-digit seeds won in the first round and just one advanced to the Sweet 16 – Oregon. No team seeded worse than a No. 5 seed made the Elite Eight.
In 2016, a record 10 double-digit seeds won in the first round and five double-digit seeds won in the second round in 1999. You're better off picking between four and eight double-digit seeds to win in the first round and two or three to win in the second round.
3. You don't have at least two Big Ten teams in the Sweet 16
It seemed like this trend was set to finally break in 2018, as the Big Ten put just four teams in the NCAA tournament field. Still, for the 11th straight season, the Big Ten put two teams in the Sweet 16 as Purdue and Michigan carried the torch for the conference. That streak extended to 12-straight seasons as three Big Ten teams – Michigan, Michigan State and Purdue – made the Sweet 16 in 2019.
In total, 33 Big Ten teams have made the second weekend since 2008.
4. You don't have at least one ACC team in the Elite Eight
Since 2007, at least one ACC team has advanced to the Elite Eight in 12 of the 13 seasons. Most notably, four ACC teams made the Elite Eight in 2016 and three made it in 2015. Two teams – No. 1 overall seed Duke and reigning national champion Virginia – made it in 2019.
5. The sum of the seeds of your Final Four teams is greater than 20
For the first 20 years of the 64-team tournament format, the number could have been 10, not 20. In 14 of the years, the sum of the seeds of the teams that made the Final Four was 10 or lower, but there have since been more dark horse teams making runs in March.
Since 1985, when the tournament expanded to 64 teams, the average sum of the seeds of the Final Four teams is 11.2 and on just two occasions (2000, 2011), the total was greater than 20. It's fine – if not encouraged, if not realistic – to pick a darkhorse team or two to make the Final Four – from 2013 to 2018, at least one team seeded as a No. 7 or worse has made the Final Four every year – but don't get carried away.
The sum of the Final Four teams in 2019 was 11 with No. 1 seed Virginia, No. 2 seed Michigan State, No. 3 seed Texas Tech and No. 5 seed Auburn.
6. You don't have any teams in the Final Four whose primary color is blue or orange
Heading into the 2021 NCAA Tournament, college basketball teams whose schools have a primary color of blue or orange had the two highest winning percentages of any color. "Blue" teams were winning NCAA tournament games at better than a 57 percent rate and "orange" teams won more than 54 percent of their tournament games.
In 2019, Virginia and Auburn met in the Final Four.
Blue schools have combined for 24 national championships, the most of any color.
7. You've picked a No. 15 seed over a No. 2 seed without considering free throws
A common trait, if not the common trait among No. 15 seeds that have upset No. 2 seeds, is free throw shooting. And we're not talking about quality of free throw shooting, but rather quantity. Those upsets have historically come down to the No. 15 seed attempting and, more importantly, making more free throws than the No. 2 seed.
The last time we saw a 15-seed upset a 2-seed, when Middle Tennessee State beat Michigan State in 2016, the Blue Raiders went 13-of-21 from the charity stripe, while the Spartans made 10-of-15 shots from there.
NCAA.com author Mitchell Northam contributed to this story.