What is a Slurve? Definition and Examples
A slurve is a breaking pitch that combines the horizontal sweep of a slider with the downward bite of a curveball, traveling 78–84 mph with a diagonal 11-to-5 shape.
Plain-English definition
A slurve is a breaking pitch that combines the horizontal sweep of a slider with the downward bite of a curveball. The word is a portmanteau of "slider" and "curve." Slurves travel faster than a true curveball (78–84 mph vs. 73–78 mph for a curve) and break more sharply downward than a slider, producing a diagonal 11-to-5 (right-hander) or 1-to-7 (left-hander) shape that is hard to classify and harder to hit.
How it's thrown and tracked
A slurve is gripped like a slider — held off-center across the seams with the middle finger pulling down through the ball at release — but with more pronounced wrist supination, which generates both horizontal sweep and gyro tilt. Modern pitch-tracking systems (Statcast, Hawk-Eye) classify breaking balls by movement vector and velocity:
- Slider: 2–8 in horizontal break, 2–4 in vertical drop, 82–88 mph.
- Curveball: 4–8 in horizontal, 10–15 in vertical drop, 73–78 mph.
- Slurve: 8–14 in horizontal, 6–10 in vertical drop, 78–84 mph.
The slurve straddles the slider/curve boundary. Statcast historically re-classified the same pitcher's slurve as either "slider" or "curveball" depending on that season's calibration; Baseball Savant introduced "slurve" as a distinct classification in 2020 to fix this.
Worked example
Charlie Morton's curveball is one of the cleanest slurves in MLB. In 2024 it averaged 80 mph with 13.2 in of horizontal break and 8.5 in of induced vertical break — too fast for a true curve, too much vertical bite for a slider. He threw it 36% of the time and hitters managed a .172 batting average against it with a 38% whiff rate. The shape — sharper than a sweeper, slower than a slider — is what makes it a slurve. Other notable slurve practitioners: Sonny Gray, Bryan Woo, prime CC Sabathia, and Mariano Rivera's hard cutter, which was sometimes classified as a high-velocity slurve.
Why it matters
The slurve has had a renaissance as front offices chase pitch-shape diversity. After the league became obsessed with the sweeper (more horizontal) and the spike curve (more vertical), the slurve fills the diagonal gap — and it's harder to identify out of the pitcher's hand because it shares release characteristics with both. Pitching labs like Driveline and Tread now coach the slurve as a complement to a hard sweeper or a fastball with vertical ride, creating better pitch-shape separation across an arsenal. For DFS and fantasy, slurve-heavy pitchers tend to over-perform their FIP against same-handed hitters but underperform against opposite-handed hitters because the diagonal break flattens out from the gloveside.
Limitations and misconceptions
A slurve is not a "bad slider" or a "loopy curve" — it is a distinct movement profile. Many fans and some broadcasters use "slurve" as a catch-all for any breaking ball with mixed movement, but tracking systems use specific velocity and break thresholds. A sweeper is *not* a slurve: the sweeper has more horizontal and *less* vertical break, while a slurve sacrifices some horizontal sweep for diagonal bite. The classification can also flip year-to-year — Shane Bieber's pre-2023 slider was occasionally tagged as a slurve before his shape tightened.
Related terms
- What is a slider?
- What is a curveball?
- What is a sweeper?
- What is horizontal break?
- What is induced vertical break?
In Legends Deck: Pitchers with a true slurve in their arsenal receive a movement-shape diversity bonus that compounds their swing-and-miss rating against same-handed hitters. Charlie Morton's card carries one of the highest Breaking Ball ratings in the game because the slurve's shape produces a higher in-game whiff probability than the modal slider when paired with his four-seam vertical profile.