What Is an Immaculate Inning in Baseball?
An immaculate inning is when a pitcher strikes out all three batters in an inning on just nine pitches. Three hitters, three strikeouts, nine pitches, and every single one a strike. It is one of the most efficient things a pitcher can do, and it happens less often than a no-hitter.
How an immaculate inning works
The math only works one way. Each of the three batters has to strike out on exactly three pitches, and all three of those pitches have to be strikes. That leaves no room for a ball, and no room for a foul ball once a hitter already has two strikes. A single wasted pitch anywhere in the frame ends the chase. The strikes themselves can be swinging or called, so a pitcher can freeze one hitter and blow it past the next. What they can’t do is miss.
How rare is it?
| Pitches | Exactly 9 |
| Strikeouts | All 3 batters |
| MLB history | ~120 times (fewer than no-hitters) |
| First one | John Clarkson, 1889 |
In more than 140 years of Major League Baseball, it has been done only around 120 times, which is fewer than the number of no-hitters ever thrown. John Clarkson threw the first recognized one in 1889, and only a few pitchers have ever managed it more than once (per the running list at Wikipedia). It has grown a little more common in the modern game, mostly because relievers now throw one high-strikeout inning at a time.
Immaculate innings in youth & travel baseball
You will almost never see a true immaculate inning at the youth level, and that is not a knock on the pitchers. Young hitters foul pitches off, take close ones, and work the count, so stringing together nine straight strikes against three of them is close to a coin flip landing on its edge. The better youth version of the same idea is a clean, efficient inning: three up, three down on a low pitch count. That is the thing worth building toward, and it shows up in the numbers even when the perfect nine-pitch frame never comes.
How GameLense reads a dominant inning
GameLense won’t hand out a trophy for an immaculate inning, but it does track the things that make one possible. It pulls strikeouts and pitch counts from your GameChanger data, so an efficient, strikeout-heavy outing stands out next to a pitcher’s ERA, WHIP, and pitch count. The point isn’t the highlight, it’s the pattern: who is missing bats and doing it on few pitches.
Frequently asked questions
What is an immaculate inning?
An immaculate inning is a half-inning in which a pitcher strikes out all three batters on the minimum nine pitches — three pitches to each hitter, every one a strike. It is one of the rarest feats in baseball, less common than a no-hitter.
How many pitches is an immaculate inning?
Exactly nine. Three batters, three strikes apiece, nine total pitches, and all nine have to be strikes — swinging, called, or a foul on a count with fewer than two strikes. A single ball, or a foul with two strikes, breaks it.
How rare is an immaculate inning?
It has happened only around 120 times in more than 140 years of Major League Baseball — fewer than the number of no-hitters ever thrown. The first came from John Clarkson in 1889. Only a handful of pitchers, including Sandy Koufax, Nolan Ryan, Max Scherzer, and Chris Sale, have done it more than once.
Is an immaculate inning harder than a no-hitter?
By the raw count, yes — there have been more no-hitters than immaculate innings in MLB history. A no-hitter is a full game of run prevention; an immaculate inning is three perfect strikeouts in a row with zero wasted pitches, and that almost never lines up in a single frame.
Can you throw an immaculate inning in youth baseball?
In theory, but it is extraordinarily unlikely. Young hitters take pitches, foul balls off, and work counts, so nine straight strikes past three batters almost never happens. It is a fun milestone to know about, not something to coach a kid to chase.
Related baseball stats & terms
See which pitchers are missing bats
GameLense pulls strikeouts and pitch counts from your GameChanger data and reads them next to ERA, WHIP, and rest — so the efficient, dominant outings are easy to spot across a season.
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