The Big Picture: 12 Teams, One Champion
Since the 2022 expansion, the MLB postseason features 12 teams — six from each league (American League and National League). This was a significant expansion from the previous 10-team format and has added new layers of excitement to the regular-season race.
How Teams Qualify
- 3 Division Winners per league — The teams with the best record in the AL East, AL Central, AL West, NL East, NL Central, and NL West each earn an automatic playoff spot.
- 3 Wild Card teams per league — The three non-division-winners with the best records in each league fill out the bracket.
The Playoff Bracket, Round by Round
Wild Card Series (Best of 3)
The first round of the playoffs features the Wild Card Series. The top two division winners in each league (by record) earn a bye and skip this round entirely. The remaining four teams play a best-of-three series:
- 3rd Division Winner vs. 3rd Wild Card (worst wild card record)
- 1st Wild Card vs. 2nd Wild Card
The higher-seeded team hosts all games in the Wild Card Series. There are no off days — it's three straight games (if needed), making it an intense sprint.
Why the bye matters: The top two seeds in each league skip the Wild Card round entirely, getting extra rest while their potential opponents grind through an intense series. In our simulations, this bye provides a measurable advantage that shows up in championship odds.
Division Series (Best of 5)
The four remaining teams in each league play a best-of-five Division Series (ALDS/NLDS). The bracket is set so that:
- #1 seed plays the lowest remaining seed
- #2 seed plays the other remaining seed
The higher seed has home-field advantage in a 2-2-1 format (Games 1, 2, and 5 at home).
Championship Series (Best of 7)
The two Division Series winners in each league meet in the ALCS or NLCS, a best-of-seven series to determine the league champion. Home-field advantage goes to the team with the better regular-season record in a 2-3-2 format.
World Series (Best of 7)
The AL and NL champions meet in the Fall Classic. Home-field advantage goes to the team with the better regular-season record, again in a 2-3-2 format.
Seeding and Why It Matters
Seeding in the MLB playoffs is determined first by division winners, then by record:
- 1st seed: Division winner with the best record (gets bye)
- 2nd seed: Division winner with the second-best record (gets bye)
- 3rd seed: Division winner with the third-best record
- 4th seed: Wild card team with the best record
- 5th seed: Wild card team with the second-best record
- 6th seed: Wild card team with the third-best record
This means a division winner always gets at least the 3rd seed, even if a wild card team has a better record. Winning your division is a major advantage.
The 2-seed vs. 3-seed gap is huge. The difference between the 2nd and 3rd seed isn't just one position — it's the difference between a first-round bye and having to play a best-of-3 series. Teams fighting for that 2nd-best division winner record have an enormous incentive.
How the 162-Game Season Creates Drama
Baseball's 162-game season is the longest in major North American sports, and the expanded playoff format has made more of those games meaningful. With 12 teams qualifying, the playoff races often feature:
- Division races that determine whether you're a 1-3 seed (with home-field or a bye) or a 4-6 seed wild card.
- Wild card races where the difference between the 3rd wild card and 4th-place (out) can come down to a single game.
- Bye races between division winners fighting for the top two seeds and the rest advantage that comes with it.
With so many teams in contention and 162 games to play, the swings in playoff odds can be dramatic. A team can go from 45% to 65% in a single week's hot streak, or see their odds crater during a tough road trip.
How Clinch Simulates MLB Playoffs
Clinch's Monte Carlo simulation plays out the remainder of the MLB season 30,000 times. In each simulation:
- Every remaining regular-season game is simulated based on team strength
- The final standings determine the 12 playoff teams and their seeding
- The full playoff bracket is simulated — Wild Card Series, Division Series, Championship Series, and World Series
- Results are tallied across all 30,000 runs
This gives you not just a playoff probability, but also division odds, wild card odds, and even a World Series win probability — all from a single comprehensive simulation.
Track MLB Playoff Odds
See every team's chances of making the postseason and winning the World Series.