Statcast, the technology behind Major League Baseball’s most detailed performance tracking, has become the backbone of modern player evaluation.
The Language of Expected Metrics
A "hard‑hit ball" is defined as any batted ball that leaves the bat at 95 mph or faster, a threshold that separates routine contact from genuine power.
Expected batting average, or xBA, quantifies the probability that a given batted ball will become a hit by factoring in exit velocity and launch angle, offering a context‑rich alternative to traditional batting average.
Expected weighted on‑base average, or xwOBA, refines that concept further by incorporating exit velocity, launch angle and the runner’s sprint speed, while EV50 captures the average exit velocity of a batter’s hardest half of all contacts.
For pitchers, EV50 flips the perspective, measuring the average exit velocity of the softest half of the balls they allow, highlighting differences in pitch sequencing and contact management.
Adjusted EV standardizes the measurement by capping the maximum recorded exit velocity at 88 mph, ensuring consistency across varying launch conditions, while bat speed — measured at the sweet spot and averaged over the top 90 % of swings — remains a key indicator of swing efficiency.
Pitchers’ outputs are further dissected through metrics such as pitch speed, spin direction and active spin, the latter expressed in revolutions per minute and tied directly to movement; release distance from the mound is also logged in feet.
xERA translates xwOBA into an ERA‑scale figure, giving fans a familiar context for pitcher performance, while catcher metrics track reaction time on steal attempts and the success rate in preventing wild pitches.
Defensive analytics include throw speed, range off the bag, and a probability score that estimates an outfielder’s chance of securing a catch, all of which feed into a broader skill‑assessment model.
On the basepaths, top running speed is recorded in feet per second, and a "Bolt" run is flagged when a player’s sprint speed reaches 30 ft/sec or higher, underscoring bursts of elite athleticism.
These data points collectively reshape how teams, analysts and fans interpret the game, turning raw numbers into actionable insight.