What is a Crooked Number in Baseball? Definition and Examples
A crooked number is any half-inning in which a team scores two or more runs — so named because every multi-digit score contains a curved digit, unlike a straight-lined '1.'
What is a Crooked Number?
A crooked number is any inning in which a team scores two or more runs. The term comes from the shape of the digits: on a line score, a "1" is drawn with straight strokes, while 2, 3, 4, 5, 6, 8, 9, and 0 all contain curves — "crooked" lines. Announcers use it constantly: "The Dodgers put up a crooked number in the fourth." The opposite is "hanging a zero," and a single run is just "a run" — nobody says "crooked number" about a one-spot.
How It's Tracked
There is no official statistic, but the concept shows up in two measurable ways:
1. Multi-run innings per game. Analysts count innings with 2+ runs because run scoring is extremely clustered. Roughly 65–70% of all runs in a typical MLB season score in crooked-number innings, even though those innings make up a small minority of half-innings played.
2. Big innings (4+ runs). A subset of crooked numbers that essentially decide games. Teams that record a four-run inning win that game roughly 75–80% of the time.
The formula for a team's crooked-number rate is simply:
Crooked Number Rate = (Innings with 2+ runs scored) ÷ (Total innings batted)
Worked Example: The 2019 Nationals
The 2019 Washington Nationals won the World Series on the back of crooked numbers. In the postseason they scored in only 31 of 104 innings batted — but 14 of those were multi-run innings, producing 61 of their 78 postseason runs (78%). The signature example: Game 4 of the NLCS against St. Louis, when they hung a 7-spot in the first inning, effectively ending the game nine outs in. Their opponents never mounted a crooked number in reply.
Why It Matters
- Lineup construction: Crooked numbers require stringing together baserunners, which is why modern front offices prioritize on-base percentage throughout the lineup rather than relying on one slugger. A solo home run is a "1"; three walks and a double is a crooked number.
- Bullpen management: Managers deploy their best relievers specifically to *prevent* crooked numbers in leverage spots — stopping an inning at one run is a win even when a run scores.
- Live betting and win probability: Win probability models (WPA) jump far more on the second run of an inning than the first, because crooked numbers flip games.
Limitations and Misconceptions
The term is slang, not a stat — don't look for it on Baseball Reference. It's also sometimes confused with "crooked inning," which means the same thing. And note the asymmetry: broadcasters say a pitcher "gave up a crooked number," but nobody credits a pitcher for a "straight number" — a scoreless inning is just a zero.
Related Terms
In Legends Deck: Our simulation engine models run clustering, not just per-at-bat outcomes — lineups stacked with high-OBP cards produce more crooked-number innings, which is exactly how real offenses win. Build for traffic on the bases, not just solo shots.