Jump
Definition
Jump is a Statcast metric that shows which players have the fastest reactions and most direct routes in the outfield. It's defined as: "How many feet did he cover in the right direction in the first 3 seconds after pitch release?"
The Jump leaderboards may be viewed at Baseball Savant here.
In addition, Jump can be broken down into three components.
• Reaction: Feet covered (in any direction) in the first 1.5 seconds. Think of it like a way to measure first step.
• Burst: Feet covered (in any direction) in the next 1.5 seconds. Think of it like a way to measure acceleration.
• Route: Compares the fielder's distance covered over the full 3 seconds to the distance covered on a direct route.
All three components of outfield jump are reported in "feet above or below Major League average," to provide proper context. ("Average" is slightly different for each play, as each type of outfield play has its own slightly different baseline -- based on the direction the outfielder is going, whether the wall is a factor, and how long the ball is in the air.)
Note that for season leaderboards, only plays with a 90% Catch Probability or harder are considered. On routine plays, there's often no "jump" or direct route even required.