Pro Baseball: Inside-The-Park Home Runs
Short Answer
Both the model and the market overwhelmingly agree that 1+ inside-the-park home runs is most likely, with only minor residual uncertainty.
1. Executive Verdict
- Early 2026 season recorded three inside-the-park home runs by mid-May.
- Projected 2026 total aligns with historical range of 10-20 occurrences.
- Fielding errors rarely aid official inside-the-park home runs historically.
- Kauffman Stadium historically leads MLB in inside-the-park home run totals.
- Elite speedsters like Bobby Witt Jr. may catalyze more inside-the-park home runs.
Who Wins and Why
| Outcome | Market | Model | Why |
|---|---|---|---|
| 8+ inside-the-park home runs | 63.0% | 45.0% | Three inside-the-park home runs by mid-May 2026 align with a 10-20 full-season projection. |
| 7+ inside-the-park home runs | 60.0% | 56.2% | Three inside-the-park home runs by mid-May 2026 align with a 10-20 full-season projection. |
| 6+ inside-the-park home runs | 75.0% | 68.9% | Three inside-the-park home runs by mid-May 2026 align with a 10-20 full-season projection. |
| 4+ inside-the-park home runs | 94.0% | 91.9% | Three inside-the-park home runs by mid-May 2026 align with a 10-20 full-season projection. |
| 5+ inside-the-park home runs | 83.0% | 78.2% | Three inside-the-park home runs by mid-May 2026 align with a 10-20 full-season projection. |
Current Context
The early 2026 MLB season has seen a low frequency of inside-the-park home runs, consistent with their historical rarity, despite a league average of five triples per team across approximately 43 games played [^] . Three distinct inside-the-park home runs (IPHRs) have been recorded recently. On April 21, 2026, Sam Antonacci of the Chicago White Sox hit his first career home run, an IPHR, following an unusual deflection by a ball boy [^]. The St. Louis Cardinals’ JJ Wetherholt also achieved an inside-the-park grand slam on May 8, 2026, which occurred due to an error by Fernando Tatis Jr. [^]. The next day, on May 9, Bobby Witt Jr. of the Kansas City Royals hit his second career IPHR, which marked his fifth home run of the 2026 season [^][^][^].
Bobby Witt Jr. displayed elite speed on his recent inside-the-park homer. His May 9 inside-the-park home run featured a home-to-home time of 14.13 seconds, demonstrating his exceptional speed [^][^]. This performance places his IPHR as the fourth fastest recorded in the Statcast Era, which began in 2015 [^][^]. The fastest times in this period include Byron Buxton's 13.85 seconds and 14.05 seconds, along with Pete Crow-Armstrong's 14.08 seconds [^][^].
2. Market Behavior & Price Dynamics
Historical Price (Probability)
Outcome probability
Date
This market has exhibited a distinct upward trend, moving from an opening price of 88.0% to a current probability of 94.0%. The most significant price movement was a single, sharp increase of six percentage points that occurred between May 9, 2026, and May 10, 2026. This price spike appears to be a direct response to the news that Bobby Witt Jr. hit an inside-the-park home run on May 9. This event was the third such home run recorded in the early part of the season, likely reinforcing the market's belief that the conditions for a YES resolution would be met.
The price action has established a clear floor, or support level, at the 88.0% mark and is currently testing a ceiling, or resistance level, at 94.0%. A critical observation is the complete lack of trading volume, with zero contracts exchanged throughout the market's history. This indicates that the price movement is not driven by trader activity but rather by adjustments in the market's underlying pricing model. The absence of volume suggests a strong consensus or low participation, with few traders willing to bet against the high probability of a YES outcome. Overall, the chart indicates a very confident market sentiment, pricing in a high likelihood that the threshold for inside-the-park home runs will be reached in 2026, a sentiment that was strengthened by recent on-field events.
3. Significant Price Movements
Notable price changes detected in the chart, along with research into what caused each movement.
📈 May 10, 2026: 14.0pp spike
Price increased from 50.0% to 64.0%
Outcome: 8+ inside-the-park home runs
What happened: The primary driver was the widely publicized inside-the-park home run by Bobby Witt Jr. on May 10, 2026, his fifth HR of the season [^][^][^]. An Instagram/MLB post featuring the speedy play, which was the 4th fastest in the Statcast era, garnered 68K likes and comments praising Witt's speed and criticizing the misplay by Tigers RF Kerry Carpenter [^][^]. This significant social media activity, coinciding with major news reports, appeared to lead speculative interest in the rare event despite no evidence of a broader trend towards 8+ inside-the-park home runs for the season [^][^]. Social media was a primary driver, accelerating enthusiasm around a rare, exciting individual event.
4. Market Data
Contract Snapshot
This market resolves to YES if all hitters combined record 8 or more inside-the-park home runs across all games during the 2026 Pro Baseball season (regular season and playoffs); otherwise, it resolves to NO. The market opened on March 10, 2026, and will close after the outcome occurs, or by December 3, 2026, 10:00 AM EST. Resolution will be determined using sources from ESPN, Fox Sports, and the Governing League.
Available Contracts
Market options and current pricing
| Outcome bucket | Yes (price) | No (price) | Last trade probability |
|---|---|---|---|
| 4+ inside-the-park home runs | $0.94 | $0.10 | 94% |
| 5+ inside-the-park home runs | $0.93 | $0.14 | 83% |
| 6+ inside-the-park home runs | $0.82 | $0.27 | 75% |
| 8+ inside-the-park home runs | $0.62 | $0.47 | 63% |
| 7+ inside-the-park home runs | $0.65 | $0.43 | 60% |
Market Discussion
Recent inside-the-park home runs in the 2026 season include Bobby Witt Jr.'s on May 9 vs. DET, Evan Carter's on April 23, and Sam Antonacci's on April 22 [^]. The rarity of these events is reflected in prediction market pricing, where options for low totals such as 6+ IPHRs for the season are priced around 75¢ [^]. Social commentary often focuses on speedy players and notes that inside-the-park home runs are generally treated as standard home runs for betting purposes [^].
5. Historically, what percentage of inside-the-park home runs during the Statcast era (2015-2025) were directly aided by a notable fielding error, and how does this factor into the 2026 projection?
| Statcast-era IT-P HRs aided by error | No explicit percentage found [^][^] |
|---|---|
| 2026 Projected Total IT-P HRs | 10-20 [^][^] |
| Official IT-P HRs and fielding errors | Exclude plays with charged errors [^][^][^] |
Fielding errors rarely aid official inside-the-park home runs. During the Statcast era (2015-2025), no explicit percentage has been found for inside-the-park home runs (IT-P HRs) directly aided by a notable fielding error [^][^]. This is primarily because official IT-P HRs generally exclude plays where a fielding error is charged, as these are typically recorded as a 'reach on error' instead [^][^][^]. Consequently, the percentage of official IT-P HRs directly aided by a notable fielding error is likely very low, given that errors disqualify official home run status [^][^].
The 2026 inside-the-park home run projection excludes error-aided plays. The total number of IT-P HRs for 2026 is projected to be between 10 and 20, consistent with historical trends within the Statcast era (2015-present) [^][^]. This projection remains unaffected by error-aided plays in the official tally, as plays with charged fielding errors are specifically excluded from official IT-P HR counts and do not factor into their resolution [^][^][^].
6. Beyond individual player speed, what potential catalysts, such as injuries to elite defensive outfielders or team-level shifts in baserunning strategy, could alter the pace of inside-the-park home runs for the remainder of the 2026 season?
| Luis Robert Jr. IL | 10-day IL (April 30, 2026) [^] |
|---|---|
| Ronald Acuna Jr. IL | IL as of May 4, 2026 [^] |
| Jasson Dominguez IL | Injured on May 7, 2026 [^][^] |
Potential catalysts that could alter the pace of inside-the-park home runs for the remainder of the 2026 season include significant injuries to elite defensive outfielders and shifts in team baserunning strategies. Recent injuries to several prominent defensive outfielders may impact the frequency of such plays. Luis Robert Jr., an elite defender, was placed on the 10-day injured list on April 30, 2026, due to a back issue [^]. Ronald Acuna Jr., recognized for his speed and defensive capabilities, also went on the injured list as of May 4, 2026, because of a Grade 1 left hamstring strain [^]. Additionally, Jasson Dominguez sustained a left shoulder sprain on May 7, 2026, after colliding with a wall, sidelining him for several weeks [^][^]. His replacement, Spencer Jones, is a fast runner but lacks proven Major League Baseball defensive experience [^].
Team strategies and widespread injuries may also influence inside-the-park home runs. Beyond individual player injuries, team-level strategic adjustments are expected to play a role. The Colorado Rockies, for instance, are planning to implement an aggressive baserunning approach, featuring quick players such as McCarthy (29.9 ft/sec sprint speed) and Doyle (29.5 ft/sec), despite their low stolen base count last season [^]. Furthermore, widespread team injuries could create defensive vulnerabilities. The Toronto Blue Jays are currently experiencing the highest injury severity, with 10 out of 24 players on their 60-day injured list, primarily due to elbow problems, which could potentially create gaps in their outfield defense [^].
7. Which MLB ballparks, such as Kansas City's Kauffman Stadium and Colorado's Coors Field, provide the most favorable conditions for inside-the-park home runs based on outfield dimensions and historical triples data?
| Kauffman Stadium ITP HRs | 16 since 2001 [^][^] |
|---|---|
| Coors Field ITP HRs | 10 since 2001 [^] |
| Coors Field 2B/3B Factor | +28% [^] |
Kauffman Stadium leads MLB in inside-the-park home runs. Since 2001, Kauffman Stadium has recorded 16 inside-the-park home runs, the highest total in Major League Baseball, a statistic often attributed to its expansive outfield and deep dimensions [^][^]. Fenway Park and Chase Field also exhibit a high incidence of inside-the-park home runs during the same period [^]. These occurrences are generally promoted by large outfields, which provide more space for a batted ball to land and roll, thus creating opportunities for extra bases and suppressing traditional home runs [^][^][^].
Coors Field and Comerica Park offer favorable conditions for triples. Coors Field has recorded 10 inside-the-park home runs since 2001 [^], and features outfield dimensions of 347 feet to left field, 415 feet to center field, and 350 feet to right field [^][^]. The ballpark also demonstrates a +28% factor for doubles and triples [^], alongside a history of a high number of triples [^]. Similarly, Comerica Park, with its deep center field stretching 420 feet [^], is considered triples-friendly according to Statcast and boasts a triples park factor exceeding 201 [^][^][^].
8. To what extent can the total number of triples in an MLB season, based on Statcast era data (2015-2025), be used as a reliable predictor for the total number of inside-the-park home runs in 2026?
| MLB Triples per Year | Approximately 500 [^][^] |
|---|---|
| ITPHR per MLB Season | Typically 10-20, averaging 13 (2001-2018) [^][^] |
| ITPHR to Triples Ratio | Approximately 1 ITPHR for every 500-1000 triples [^][^][^] |
The total number of triples in an MLB season cannot be reliably used as a predictor for the total number of inside-the-park home runs (ITPHR) in 2026. There is no available evidence from sources providing year-by-year paired data or regression analyses to suggest that triples can predict ITPHR effectively [^][^][^].
Inside-the-park home runs are significantly rarer than triples. MLB league triples are considerably more common, with approximately 500 occurring per season, and an estimated total of around 1100 across leagues for 2025 [^][^]. In contrast, ITPHR are a much rarer occurrence, typically numbering between 10 and 20 per MLB season in the modern era, with an average of about 13 from 2001 to 2018 [^][^].
The rarity of inside-the-park home runs prevents reliable prediction based on triple totals. Although both ITPHR and triples can be influenced by factors such as player speed, defensive errors, and unique ballpark characteristics, the extreme infrequency of ITPHR makes them unsuitable for reliable prediction. Roughly one ITPHR occurs for every 500 to 1000 triples, highlighting this significant disparity [^][^][^].
9. How does the early 2026 season's rate of inside-the-park home runs compare to the historical frequency observed annually during the Statcast era (2015-2025)?
| Standard ITPHR in early 2026 season | 0 (approximately six weeks in) [^][^] |
|---|---|
| Historical annual ITPHR (Statcast era) | 10-20 [^] |
| MLB ITPHR average (since 2001) | 13 per season [^] |
Early 2026 inside-the-park home runs are notably absent so far. As of approximately six weeks into the early 2026 season, no standard inside-the-park home runs (ITPHR) have been reported [^][^]. This current absence contrasts significantly with the historical frequency observed during the Statcast era (2015+), which typically records between 10 and 20 ITPHRs annually [^]. While no standard occurrences have been noted, one anomalous ITPHR candidate was reported on April 21, 2026, described as involving a ball boy deflection [^].
Historically, inside-the-park home runs average around 13 per season. Looking at a broader timeframe, Major League Baseball has averaged approximately 13 inside-the-park home runs per season since 2001 [^]. More recently, the 2025 season saw at least 6 inside-the-park home runs recorded by late September [^].
10. What Could Change the Odds
Key Catalysts
Prediction markets indicate varying probabilities for inside-the-park home runs (IT-PHR) for the 2026 season as of mid-2026, with 4+ at 88¢ (88% prob), 5+ at 83%, 6+ at 75%, 7+ at 60%, and 8+ at 50% [^] . Historically, Major League Baseball (MLB) IT-PHRs have been rare, with 10-20 occurring per season today and 975 from 1951-2000, representing 0.63% of total home runs during that period [^].
Key bullish catalysts include the presence of elite speedsters such as Bobby Witt Jr. and Elly De La Cruz [^][^]. Bobby Witt Jr. notably achieved an inside-the-park home run with a 14.13s bases run [^][^]. An example for 2026 includes Will Benson's inside-the-park home run on Mar 8 [^]. However, a bearish factor is the general rarity of inside-the-park home runs in modern ballparks [^].
Key Dates & Catalysts
- Expiration: December 03, 2026
- Closes: December 03, 2026
11. Decision-Flipping Events
- Trigger: Prediction markets indicate varying probabilities for inside-the-park home runs (IT-PHR) for the 2026 season as of mid-2026, with 4+ at 88¢ (88% prob), 5+ at 83%, 6+ at 75%, 7+ at 60%, and 8+ at 50% [^] .
- Trigger: Historically, Major League Baseball (MLB) IT-PHRs have been rare, with 10-20 occurring per season today and 975 from 1951-2000, representing 0.63% of total home runs during that period [^] .
- Trigger: Key bullish catalysts include the presence of elite speedsters such as Bobby Witt Jr.
- Trigger: And Elly De La Cruz [^] [^] .
13. Historical Resolutions
Historical Resolutions: 4 markets in this series
Outcomes: 4 resolved YES, 0 resolved NO
Recent resolutions:
- KXMLBSTATCOUNT-26ITPHR-3: YES (May 10, 2026)
- KXMLBSTATCOUNT-26ITPHR-2: YES (Apr 24, 2026)
- KXMLBSTATCOUNT-26ITPHR-1: YES (Apr 22, 2026)
- KXMLBSTATCOUNT-26IMMACULATE-AP-1: YES (Mar 31, 2026)
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