Introduced during the 2017 season, Sprint Speed is a Statcast metric that aims to more precisely quantify speed by measuring how many feet per second a player runs in his fastest one-second window.
Why it's useful
Approximately seven full-effort strides can be captured over the course of a one-second window, so Sprint Speed rewards those who can sustain their speed over a longer period of time.
Sprint Speed captures top running speed both on the bases and in the field. On an individual outfield play, Sprint Speed is the basis of Statcast's speed-based range metric, Catch Probability. On a cumulative basis, the metric can be used to create a variety of speed-based leaderboards.
In 2018, the metric was updated for hitters/runners to include the top home-to-first times as well as the previously qualified two-base runs, in an attempt to include more useful information and get to a meaningful number more quickly.
Currently, the metric includes "qualified runs" from these two categories:
• Runs of two bases or more on non-homers, excluding runs from second base when an extra-base hit happens.
• Home-to-first runs on "topped" or "weakly hit" balls.
Factoring in some minor regression to the mean, Sprint Speed includes the average of approximately the top 70 percent of those qualified runs.
Example: The following leaderboard is the Top 10 of the more than 450 players who had at least 10 qualified runs in the 2017 season.
Top 2017 Sprint Speed by baserunners (min. 10 qualified runs)
31.0 feet per second -- Victor Robles
30.7 feet per second -- Byron Buxton
30.5 feet per second -- Magneuris Sierra/Adam Engel
30.3 feet per second -- Trea Turner/Delino DeShields/Mallex Smith
30.1 feet per second -- Billy Hamilton/Bradley Zimmer/Amed Rosario
View full leaderboard
Watch: Statcast measures Byron Buxton's Sprint Speed on an inside-the-park homer.