The Language of Statcast
Statcast has become the backbone of modern baseball analysis, capturing every swing, pitch and fielding motion with millisecond precision.
A hard‑hit ball is defined as any contact that leaves the bat at 95 mph or higher, a threshold that separates routine grounders from potential extra‑base hits.
When a batted ball travels between eight and 32 degrees in launch angle, it typically falls into the sweet spot that maximizes distance while keeping the ball in the air long enough to clear the infield.
Expected batting average, or xBA, translates the quality of a contact into a probability that the resulting play will be a hit, offering a snapshot of a hitter’s expected performance.
xwOBA builds on that concept by layering exit velocity, launch angle and sprint speed into a more nuanced estimate of a ball’s likelihood of becoming a hit.
EV50 captures the average exit velocity of a batter’s hardest half of contacts, or conversely the softest half of a pitcher’s allowed batted balls, highlighting consistency or vulnerability.
Bat speed, measured at the bat’s sweet spot, is a key driver of exit velocity; a swing that exceeds 75 mph is generally classified as fast and often produces higher launch angles.
An Ideal Attack Angle of 5 to 20 degrees reflects a swing path that balances loft and line‑drive potential, while the vertical angle of the swing arc in the 40 ms before contact reveals how steep the approach is.
xERA converts xwOBA into a familiar ERA scale, giving pitchers a context‑aware estimate of runs they might allow based on the quality of contact they surrender.
Beyond Contact: Reaction and Speed
Jump measures outfielders’ reaction speed and route efficiency, identifying players who reach balls faster and more directly than their peers.
A Bolt is recorded whenever a runner’s sprint speed reaches at least 30 ft/sec, marking a burst of speed that can turn a routine grounder into a game‑changing play.