Go ahead, do the math.

Whatever numbers you want to use, it all comes out the same:

• 40 -- The number of games these teams four teams have lost over the past four months.
• 22 -- The largest number of combined seeds ever to become a Final Four.
• 19 -- The number of underdogs that have won during the first 60 games of the tournament (essentially one of every three games).
• 13 -- It's the most losses ever for a Final Four team ... and this collection has two such teams.

This is the most upsetting NCAA Tournament ever, which has turned into the most unlikely Final Four in the 22 years that teams have been seeded into the tourney.

Sunday, fifth-seeded Florida and No. 8 North Carolina joined No. 8 Wisconsin and top-seeded Michigan State, which officially loaded this Final Four with more long shots than any other, surpassing the 1980 event.

That Final Four, also played in Indianapolis, featured a No. 2 (Louisville), No. 5 (Iowa), No. 6 (Purdue) and a No. 8 (UCLA).

This foursome is quite a collection, reaching the RCA Dome with very different styles and via very different paths through the tournament. Saturday, it's Michigan State vs. Wisconsin at 5:42 p.m. ET, followed by Florida vs. North Carolina.

Michigan State
The Spartans (30-7) win with experience, toughness and balance. They lived up to their top seeding in the Midwest Region, and after dispatching No. 16 Valparaiso in the first round, they trailed in the second half before rallying to beat eighth-seeded Utah, fourth-seeded Syracuse and second-seeded Iowa State.

Wisconsin
The eighth-seeded Badgers (22-13) are the most unlikely Final Four team since LSU in 1986. They were 11-10 at one point, but have turned it up in the tournament, imposing their will on every team they've played (read: great defense and slow-down game). They beat ninth-seed Fresno State, then upset top-seeded Arizona, No. 4 Louisiana State and No. 6 Purdue.

North Carolina
Bashed all year for what was viewed as a terrible regular season, the Tar Heels (22-13) win with a big front line and a sharp-shooting freshman (Joseph Forte). They shook off a first-round loss in the ACC tourney by beating No. 9 Missouri in the first round and then dropped top-seeded Stanford and in the South Regional beat fourth-seeded Tennessee and seventh-seeded Tulsa to reach their record 15th Final Four.

Florida
The go-go Gators (28-7) captured a share of the SEC title, but were nearly dumped in the first round by 12th-seeded Butler. They bounced back to run past former coach Lon Kruger's fourth-seeded Illinois, ran top-seeded Duke ragged, and outgunned No. 3 Oklahoma State. They do it with speed, depth and the boundless energy of youth. Seven of their top 10 players are freshmen or sophomores.

Stars of the Weekend

• Joseph Forte, North Carolina: The freshman picked a fine time to score a career-high 28 points, and he also grabbed eight rebounds in leading the Tar Heels past Tulsa and into their record 15th Final Four.
• Mike Miller, Florida: Named the East Regional MVP, the sophomore scored a team-high 14 points, including five quick points to quell Oklahoma State's second-half comeback.
• Jon Bryant, Wisconsin: The senior guard continued his hot play in the tournament, scoring 18 points on 5 of 9 shooting from 3-point range. He's averaging 16.7 in the tourney -- nearly double his regular-season output. He's also shooting 50 percent from beyond the 3-point arc in the tournament.
• Morris Peterson, Michigan State: Scored a team-high 18 points, 13 of those coming in the final 7:34, in helping the Spartans secure a return trip to the Final Four.
• Jamaal Tinsley, Iowa State: Scored 18 points and finished the tournament averaging 17.5. The junior point guard entered the tournament averaging just 10.8 per game.

Sweet emotion

In a season in which North Carolina was criticized for everything, the knocks on the Tar Heels' emotional preparation were perhaps loudest. Often outplayed by teams with seemingly inferior talent, UNC seemed to sleepwalk through the first four-plus months of the season.

The Heels appear to be wide awake now.

"I didn't follow them a bunch this year," Tulsa coach Bill Self said. "But, from the outside looking in, they appear to be playing with greater passion.

"Whenever they play, I have a hard time viewing them as an underdog. Maybe in the point spread they will be, but they have been there before. They know how to win this time of year."

Winning when it counts

The Final Four participants all share this in common: None was the top-seeded team in its conference tournament.

Florida and Michigan State at least shared their league regular-season championships, but were seeded third and second in the SEC and Big Ten tournaments.

North Carolina and Wisconsin? Forget it: The Heels were the ACC's fourth seed, the Badgers were sixth place in the Big Ten.

Another ride on Tobacco Road

Florida is back in the Final Four for the second time in school history. While the 1994 team had its run stopped in the national semifinal by Duke, this one will have a crack at the Blue Devils' neighbor, North Carolina.

The Saturday date could easily have been a rematch; the Gators and Tar Heels were both at the Maui Invitational in November. Florida, however, fell to Purdue in the semifinals and the Boilermakers went on to lose the title game to North Carolina.

Good to be back

By guiding Florida into the Final Four, Billy Donovan joins some select company, becoming the sixth coach to have also played in the main event. The others:

• Vic Bubas (played for North Carolina State, coached Duke).
• Dick Harp (both at Kansas).
• Bobby Knight (played at Ohio State, coached at Indiana)
• Bones McKinney (played at North Carolina, coached at Wake Forest)
• Dean Smith (played at Kansas, coached at UNC).

Same old dance partner

By defeating Tulsa in Sunday's South Regional final in Austin, North Carolina accomplished a few milestones:

• The Tar Heels joined fellow No. 8 seed Wisconsin in becoming the lowest-seeded team to advance to the Final Four in 14 years.
• It is their 15th Final Four, breaking their tie with UCLA for most appearances all-time.
• The Tar Heels become the first team to have qualified for the event in seven different decades.

No D like Spartan D

While watching the first halves of their games, it would be difficult to pick Michigan State as the favorite to win it all. But when the second half begins, the Spartans show why they are considered special.

Saturday, MSU outscored Iowa State 20-3 in the final 4:53. They were just as tough in the Sweet 16, closing out Syracuse with a 19-3 run. It was the same story in the second round, where MSU trailed Utah but made the second half their own, outscoring the Utes 36-18 in the final 18 minutes.

Big Ten? Make it big 14

With Wisconsin and Michigan State now in the Final Four, the Big Ten has a chance to tie its record for most wins by a conference in a single NCAA Tournament.

In 1989, the Big Ten won 15 games. The league has won 13 games and is guaranteed a 14th because of the Michigan State-Wisconsin matchup in a national semifinal. That would become 15 if one of the teams wins the national championship as Michigan did in 1989.

Here's a look at the conferences that reached the Sweet 16 and how they're doing: