What is the Forkball? Definition and Example
A forkball is an off-speed pitch thrown with the index and middle fingers spread wide around the ball, producing low spin and a sharp downward tumble that mimics a fastball before falling out of the strike zone.
Plain-English Definition
A forkball is a slow, tumbling off-speed pitch thrown by jamming the ball deep between a wide split of the index and middle fingers. The grip kills backspin almost entirely, so the ball loses its normal Magnus lift and drops as gravity takes over — but the arm action looks like a fastball. To a hitter, it reads fastball out of the hand and then falls off the table just as the swing begins. It is the deeper, slower, lower-spin cousin of the splitter, with the same family of action but more extreme tumble and a bigger velocity gap from the four-seamer.
How the Forkball is Thrown and Measured
The grip jams the ball as far back into the V between the index and middle fingers as the pitcher can stretch — often touching the webbing. The two fingers grip the ball on opposite sides; the thumb supports underneath. Release is straight over the top with a stiff wrist; the wide finger spread prevents the wrist snap that creates backspin.
Statcast tracks the pitch under the FO classification (or sometimes folds it into the splitter family). Defining ranges:
- Velocity: 78–88 mph — usually 8–14 mph below the pitcher's four-seamer.
- Spin rate: 800–1,500 rpm — well below the ~2,200 rpm of a typical fastball and lower than most splitters.
- Vertical drop: 35–55 inches of total vertical movement, with negative induced vertical break (the ball drops *more* than gravity alone would dictate).
- Spin efficiency: often below 30%, since the grip prevents pure backspin.
The release looks identical to the fastball in arm speed and slot, which is why pitch tunneling is the forkball's primary weapon.
Worked Example
Kodai Senga's "ghost fork" is the defining modern forkball. In his 2023 rookie season with the Mets, the pitch averaged 84.0 mph, generated 56 inches of total drop, and produced a 60.4% whiff rate — the highest single-pitch whiff rate of any qualified pitch in MLB that year. Spin rate sat near 1,400 rpm with a spin efficiency under 25%. Senga threw it roughly 28% of the time and struck out 202 batters in 166 innings largely on the strength of that one pitch.
Historically, Hideo Nomo used a forkball as his out-pitch in his 1995 NL Rookie of the Year season, fanning 236 batters with a fork that fell 50+ inches. Hideki Okajima and Kazuhiro Sasaki rode the same shape to MLB success.
Why the Forkball Matters
The forkball is one of the most efficient swing-and-miss pitches in baseball when commanded. Because the action is tumbling vertical drop rather than horizontal sweep, it gets called strikes at the top of the zone and chase whiffs below. It is also a heavy ground-ball pitch on contact — Senga's forkball generated a 58% ground-ball rate in 2023, feeding into a low HR/9.
For pitch design, the forkball is a "kill shot" rather than a primary offering. Pitchers throw it 20–30% of the time at most, usually in two-strike counts where a swinging strike ends the at-bat.
Limitations and Misconceptions
The forkball is often confused with the splitter, but the splitter has a tighter finger spread, higher velocity (typically 84–90 mph), and less vertical drop. Forkballs are slower, deeper-gripped, and tumble more.
The pitch has a reputation for taxing the elbow because the forced finger spread stresses the UCL. Many pitchers cannot throw it at all — their hands are too small to maintain the grip. Command is also notoriously difficult; the lack of spin makes the pitch unpredictable, and it is easy to hang in the middle of the zone.
Related Terms
In Legends Deck
Forkball-heavy pitchers are scored on Legends Deck cards using their FO-specific whiff rate, drop in inches, and chase rate below the zone. Senga's ghost fork drives an elite "Putaway" rating that activates in two-strike simulated counts, where the pitch reproduces its real-world 50%+ whiff outcome distribution.