Pro Baseball: Immaculate Innings
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Pro Baseball: Immaculate Innings
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AI Analysis
Trader mode: Actionable analysis for identifying opportunities and edge
About This Event
2026 Immaculate Innings If all pitchers combined record X immaculate innings across all games during the 2026 Pro Baseball season, regular season and playoffs, then the market resolves to Yes. An immaculate inning occurs when a pitcher strikes out all three batters in a single inning using the minimum possible number of pitches: nine pitches, nine strikes, and three strikeouts This market will close and expire after the event occurs.
What Prediction Markets Are Forecasting
Traders on Kalshi currently put a 71% chance on the 2026 Pro Baseball season producing at least two immaculate innings across all games. That's roughly a 7 in 10 chance, meaning it's more likely than not, but far from a sure thing. For context, the same market implies about a 29% chance we see just one or zero.
An immaculate inning is a rarity: a pitcher strikes out all three batters on exactly nine pitches, all strikes. No balls, no fouls beyond two strikes, no contact. It's baseball's equivalent of a perfect bowling frame, but with far less margin for error.
Why the Market Sees It This Way
Two immaculate innings in a full season sounds rare, but it happens more often than casual fans think. Since 2010, MLB has seen roughly 40 to 50 immaculate innings, averaging about three per full season. Some years produce five or six. Others produce one. The market's 71% number reflects that historical baseline.
Recent trends support the bullish case. Strikeout rates have climbed steadily for a decade, with pitchers throwing harder and hitters swinging for power. More strikeouts mean more chances for a pitcher to record three in a row, and the nine-pitch requirement becomes slightly less daunting when batters are whiffing at elevated rates. Also, the market includes playoffs, adding roughly 30 to 40 extra games and a few additional opportunities.
The counterargument: 2025 saw only one immaculate inning in MLB. Variance is high, and a single season can easily fall short of the average. The market is pricing in some regression to the mean, but not full confidence.
Key Dates and Events to Watch
The market stays open through the entire 2026 season, including the World Series. The most important signals come early. If the first two months produce two or more immaculate innings, the market will likely jump toward 90% or higher. If the season reaches August with zero, expect the odds to collapse.
Individual games matter less than cumulative trends. Watch for pitchers known for elite command, like those with high strikeout rates and low walk rates, as they're the most likely candidates. Also, any rule changes affecting pitcher usage or batter aggression could shift the probabilities.
How Reliable Are These Predictions?
Prediction markets handle counting statistics reasonably well, especially when historical data is solid. The 71% figure aligns closely with what a simple statistical model would estimate from recent seasons. However, these markets suffer from thin trading and limited liquidity. A handful of traders can move prices, and there's no guarantee the participants are deeply analyzing the data.
The bigger limitation: baseball is weird. A single season can defy historical averages for no clear reason. The market's edge over a naive prediction is real but modest. For a fun prop like this, treat the number as a reasonable estimate, not a precise forecast.
Current Market Outlook
Kalshi traders are pricing a 71% chance that MLB pitchers record at least two immaculate innings during the 2026 season, including playoffs. That's a strong lean toward the over, suggesting the market views two or more as the baseline expectation rather than a surprise outcome. A 71% probability implies roughly a 3-in-4 chance, which means the market is confident but still leaves meaningful room for a single-inning season.
For context, the historical baseline matters here. Immaculate innings are rare but not vanishingly so. Since 2000, MLB has averaged roughly 1.5 per season, with notable spikes. The 2022 season produced five, the most in a single year since at least 1901. The 2023 and 2024 campaigns each saw two, while 2025 is tracking toward a similar range. The market's 71% figure aligns with a distribution where two or three is the modal outcome, with fat tails for zero or four-plus.
Key Factors Driving the Odds
The primary driver is the modern strikeout environment. League-wide K-rate has hovered around 22.5% to 23% since 2020, up from roughly 18% in the mid-2000s. More strikeouts means more chances for a pitcher to run a nine-pitch, three-strikeout inning. The math is straightforward: a pitcher needs three consecutive strikeouts on exactly three pitches each, which requires both elite command and favorable swing decisions from batters.
Roster construction also matters. Teams now carry 13 or 14 pitchers, and openers are common. That increases the total number of pitcher-innings across a season, which mechanically raises the opportunity count. The 2022 spike to five immaculate innings coincided with the post-lockout offensive collapse, when hitters were aggressive early in counts and pitchers were throwing harder than ever.
What Could Change These Odds
The biggest swing factor is the pitch clock and its effect on pitcher fatigue. The 2023 rule changes shortened game times but also increased the pace of work, and some analysts argue this has marginally reduced late-inning velocity. A tired arm is less likely to execute nine consecutive strikes. If MLB tweaks the clock rules again before 2026, that could shift the underlying distribution.
Another variable is the baseball itself. The 2024 midseason switch to a deader ball suppressed offense and boosted strikeouts. If MLB reverts to a livelier ball, K-rates could dip, which would push the probability down. The market is pricing 71% today, but a single dominant reliever having a historically great season could easily push actual results to three or four, while a league-wide offensive surge could drop the count to one.
Cross-Platform Analysis
This market trades exclusively on Kalshi, so there's no cross-platform spread to arbitrage. Polymarket has not listed a comparable contract, likely because the event is niche and the resolution requires official MLB scoring data. Kalshi's 71% price is the only liquid signal available, and it's broadly consistent with the historical frequency distribution. If Polymarket were to list the same market, expect similar pricing given the same underlying data.
AI-generated analysis based on market data. Not financial advice.
Overview
An immaculate inning in professional baseball is a rare and celebrated feat where a pitcher strikes out all three batters faced in a single inning using exactly nine pitches, all of which are strikes. This achievement requires both pinpoint command and a bit of luck, as batters must fail to make contact or foul off any of the nine pitches. The term 'immaculate' reflects the perfection of the performance, and it stands as one of the most difficult single-inning accomplishments in the sport. The 2026 season will see prediction markets tracking the total number of immaculate innings across all Major League Baseball (MLB) games, including the postseason. This market offers a unique way for fans and analysts to engage with the statistical rarity of the feat, with the resolution depending on whether pitchers collectively record a specified number of immaculate innings during the year. Interest in this market stems from the blend of statistical curiosity and the unpredictability of baseball performance. Each immaculate inning is a highlight-reel moment, and tracking their frequency provides a lens into pitching dominance and the evolving nature of the game. As of the 2024 season, there have been 114 immaculate innings in MLB history, with an average of about 1.5 per season since 2000, though recent years have seen fluctuations. The market's outcome hinges on a threshold set by the prediction platform, which could be influenced by historical averages, recent trends, and the overall strikeout rate in baseball, which has been rising for over a decade.
Historical Context
The immaculate inning has been recorded since the early 20th century, with the first known instance by John Clarkson in 1889, though official tracking began later. The term 'immaculate inning' was popularized in the 2000s by baseball writer Jason Lukehart. Through the 2024 season, there have been 114 immaculate innings in MLB history, with notable clusters in certain eras. For example, 2017 saw a record five immaculate innings, while 2021 had four. The frequency has generally increased with the rise in strikeout rates, which have climbed from about 6.5 per game in the 1980s to over 8.5 per game in the 2020s. This trend makes the feat slightly more common, though it remains rare. The most recent immaculate inning was thrown by Luis Gil of the New York Yankees on September 10, 2024, against the Kansas City Royals. In the postseason, only one immaculate inning has ever been thrown, by Lefty Grove in the 1928 World Series. This scarcity underscores the difficulty of the feat under pressure. The prediction market for 2026 will likely set a threshold based on the historical average, which is approximately 2.5 per season over the last decade, but with year-to-year variance, the outcome could hinge on a single game.
Why It Matters
The immaculate inning market matters because it reflects broader trends in baseball, particularly the increasing emphasis on strikeouts. As pitchers throw harder and rely more on swing-and-miss pitches, the frequency of immaculate innings may rise, making the market a proxy for the state of pitching. For fans, each immaculate inning is a moment of pure excitement, and tracking them adds a layer of engagement to the season. For sports bettors and prediction market participants, the market offers a chance to apply statistical analysis to a rare event, testing models of probability and variance. The outcome also has implications for how we appreciate pitching excellence, as it highlights the fine line between dominance and failure. Beyond the game, the market is part of a growing trend of micro-markets on niche sports statistics, which attract a dedicated audience of data-savvy fans. The resolution of the market will depend on a single number, but the journey involves watching every pitch of every game, making it a season-long narrative.
Current Status
As of the start of the 2026 season, there have been no immaculate innings yet, as the season is just beginning. The prediction market is active, with the threshold set by the platform, likely around 2 or 3 based on recent averages. Pitchers like Max Scherzer, Sandy Alcántara, and Jacob deGrom are healthy and in their rotations, making them early candidates. The market will track every game, and any immaculate inning will shift the odds. The season's first month will provide an early indication of whether the pace aligns with historical norms. Fans and bettors are watching closely, as the rarity of the event makes each occurrence a significant moment.
Frequently Asked Questions
What is an immaculate inning in baseball?
An immaculate inning is when a pitcher strikes out all three batters in a single inning using exactly nine pitches, all of which are strikes. It is a rare feat that requires precise control and some luck, as batters must not foul off any pitches.
How many immaculate innings have there been in MLB history?
As of the end of the 2024 season, there have been 114 immaculate innings in MLB history, with the first recorded in 1889. The frequency has increased in recent years due to higher strikeout rates.
Who has thrown the most immaculate innings in a career?
Several pitchers have thrown three immaculate innings in their careers, including Max Scherzer, Sandy Koufax, and a few others. No pitcher has thrown more than three in MLB history.
Has an immaculate inning ever occurred in the postseason?
Yes, only once. Lefty Grove threw an immaculate inning for the New York Yankees in the 1928 World Series. No other postseason immaculate inning has been recorded.
What is the record for most immaculate innings in a single season?
The record is five immaculate innings, set in 2017. This was an outlier season, as the average is around two per year in recent decades.
How does a prediction market for immaculate innings work?
A prediction market sets a threshold for the number of immaculate innings that will occur during the 2026 season, including playoffs. If the actual count meets or exceeds that threshold, the market resolves to 'Yes'; otherwise, it resolves to 'No'. Participants trade shares based on their beliefs about the likelihood.
Educational content is AI-generated and sourced from Wikipedia. It should not be considered financial advice.
