Line Drive Rate
Also known as: LD%, liner rate
Line drive rate (LD%) is the percentage of batted balls classified as line drives (typically 0–25° launch angle with hard contact). This means the batted-ball type with the highest expected batting average.
Line drives carry the highest expected batting average of any batted-ball type. This is because they are hit hard, stay in the air long enough to land safely, and are difficult to field. An elite LD% is generally considered 25% or above. Hitters can improve their LD% by optimising barrel path to stay on the pitch plane longer. This reduces rollover, and improving attack angle to match the pitch's downward trajectory. LD% is a more stable indicator of true contact quality than batting average over small samples.
During tee work, focus on hitting the back half of the ball. This means the part furthest from the pitcher. This means and drive it straight back through the imaginary pitcher's mound. This produces the contact geometry that generates the highest line drive rate.
Compare your LD% data across pitch velocity bands in your SwingVantage session reports. This means a significant LD% drop on high-velocity pitches confirms a timing cause. A consistent LD% decline across all pitch speeds confirms a barrel-path or contact-point cause that does not depend on timing.
Example
Her 28% line drive rate was the clearest indicator of her contact quality — she was reliably matching the pitch plane and squaring the ball.
Why it matters
SwingVantage's analysis of barrel path, attack angle, and contact consistency directly maps to the mechanical drivers of line drive rate. This means improvements in the analysis translate to real improvements in batted-ball quality.
How it shows up on video
On video, line drive production is associated with a barrel that arrives at the contact point on a matching plane to the pitch trajectory. This makes contact at or slightly above the ball's equator. Common errors that suppress line drive rate include a barrel arriving below the pitch plane (undercutting. This produces pop-ups), a barrel arriving from above the pitch plane (chopping. This produces grounders). A barrel arriving after the optimal contact zone with the arms still bent (producing weak, pull-side flares rather than hard-hit drives).
Common mistakes
- Confusing line drives with "contact hitting" and reducing swing aggressiveness in an attempt to make more contact. This means line drives require hard barrel contact, and pulling back swing intensity produces soft grounders and flares rather than true line drives
- Using a barrel path that is too flat or downward across all pitch heights rather than adjusting attack angle to match specific pitch locations. This means middle-height pitches need a flatter approach than low-in-the-zone pitches
- Treating LD% as a random outcome rather than a mechanical metric. This means over a sufficient sample, LD% is one of the most mechanically stable statistics available and should be used as a training target
- Neglecting the attack angle dimension of line drive production and working only on barrel path without also verifying that the approach angle at contact is in the 10–25 degree window that produces true line drives rather than flat grounders
In SwingVantage Motion Lab
SwingVantage correlates barrel path angle and contact location on the ball's surface with batted-ball outcome categories. This builds a session-level line drive rate estimate from mechanical data alone. Pitchers see a suppressed LD% metric that quantifies how effectively their pitch movement and location is preventing clean barrel contact across rep sequences.
Related terms
- Ground Ball RateGround ball rate (GB%) is the percentage of batted balls that are grounders. This means typically a negative indicator for power hitters, though contact hitters may use it strategically.
- Pop-Up (Batting)A pop-up is a batted ball with extreme backspin and a very steep launch angle (above 50°) that goes nearly straight up and is almost always caught for an out.
- BarrelA barrel is a batted ball combining high exit velocity with an optimal launch angle at the same time. This means the exact combination most likely to produce extra-base hits.
- Hard-Hit RateHard-hit rate is the percentage of batted balls struck above a set exit-velocity threshold — typically 95 mph in MLB, scaled lower for amateur levels. It measures contact quality independent of luck.
- Exit Velocity (EV)Exit velocity is how fast the ball comes off the bat, in mph. It is a ceiling metric — the harder you hit it, the farther it can go.
- Launch Angle (Batting)Launch angle in batting is the vertical angle the ball leaves the bat. Roughly 10–25° produces the hardest, most productive contact.
Related guides & benchmarks
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