The Live At-Bat Take-or-Swing Chase Game: A Coach's Guide to Lowering Chase Rate

Ask any coach what separates a good high-school or travel-ball hitter from a great one, and "swings at strikes" comes up fast. The stat that captures it is chase rate — the percentage of pitches thrown outside the strike zone that a hitter swings at. It is one of the most predictive and stable plate-discipline numbers we have, and it is trainable. The catch is that most discipline work happens in low-pressure environments — tee, front toss, a stand-in bullpen — and discipline built there tends to evaporate the moment a hitter steps in against a real arm at real speed. The Live At-Bat Take-or-Swing Chase Game is built to close exactly that gap.

What chase rate is, and why it matters

Chase rate (you will also see it as O-Swing% at FanGraphs, or "chase %" in MLB's Statcast glossary) is simple: of all the pitches a hitter sees outside the zone, what share did they offer at? Lower is better. For reference, big-league hitters as a group chase roughly a quarter to a little under a third of out-of-zone pitches; amateur and youth hitters typically chase far more, especially with two strikes and against anything that spins.

Why obsess over it? Because chasing is where at-bats go to die. A swing at a pitch off the plate is, at best, weak contact and, more often, a whiff or a rollover. Pitchers make their living getting hitters to expand the zone. A hitter who forces pitchers back into the strike zone sees more hittable pitches, works deeper counts, walks more, and — counterintuitively — often hits for more power, because the pitches they do swing at are the ones they can drive. Lowering chase rate is not about being passive; it is about being selectively aggressive.

Why a live, game-speed drill (and not more tee work)

Swing decisions are a perception problem before they are a mechanics problem. The hitter has a few hundred milliseconds to pick the ball up out of the hand, read its location and movement, and decide go/no-go. Research on expert batting — including work by sport scientist Rob Gray and the broader pitch-recognition literature in journals such as the Journal of Sports Sciences — consistently shows that elite hitters are not superhuman swingers so much as superior recognizers and deciders. They gather information earlier and commit later.

That skill is speed-specific and context-specific. A hitter can look disciplined off a 40-mph tee feed and completely lose the plot against a live 78-mph fastball with an offspeed mixed in, because the decision clock is different and the arousal is different. Driveline Baseball's public work on swing decisions makes the same point from the data side: swing-decision quality is a trainable skill, and it is best trained with realistic pitch recognition and clear, immediate feedback — not with reps that remove the very pressure that causes chasing. If you want a hitter to stop chasing in games, you have to let them practice deciding in something that feels like a game.

How the drill works

The premise strips an at-bat down to one job. The hitter takes full, committed at-bats against a live pitcher (from behind an L-screen) or a high-velo machine programmed to mix in-zone and off-zone locations. A charter calls every pitch ball or strike against an agreed, visible strike zone, and tracks two numbers only: out-of-zone pitches seen, and out-of-zone pitches swung at. That is chase rate.

Crucially, contact quality is ignored. You are not coaching the swing in this drill; you are coaching the decision to swing. A hitter can foul three balls off the screen and "lose" the at-bat by a hitting scorecard while winning the drill because they laid off everything out of the zone. Conversely, a hitter can smoke a line drive on a pitch six inches off the plate and it still counts against them — because in a game, over time, that habit costs them.

Run blocks of four to six complete at-bats, roughly 20-30 pitches, compute the chase rate, post it, and let the hitter try to beat it. The competition is the engine. When you put a single clean number on the whiteboard and let a group chase their personal best, discipline stops being a nag from the coach and becomes a game the hitter wants to win.

Fitting it into practice

This is a live-arm or machine station, so it slots naturally into the same block as your regular batting practice or a live-ABs day. A few placement tips:

• Run it early in the hitting block, when hitters are fresh and recognition is sharp, not at the end when fatigue turns everything into flinch swings.
• Keep the charter role rotating among players. Charting teammates trains their eyes for the zone too, and it keeps the station moving.
• Pair it with a hard-contact station so hitters get their aggression out elsewhere and don't feel like practice has become all takes.
• In-season, a couple of short blocks a week is plenty to move the number. It is also excellent showcase prep, because scouts and college coaches notice a hitter who controls the zone.

One workload note: if you use a live pitcher, this is real throwing. Honor MLB Pitch Smart pitch-count and rest guidelines for that pitcher's age — the drill is about the hitter, but the arm on the mound still counts.

How to progress it

Start easy enough to succeed. For a 12U or a hitter new to the drill, slow the machine and make the in-zone/out-of-zone split obvious so they can feel what a good take is. Then ratchet difficulty in layers:

1. Raise speed toward true game velocity for the age group.
2. Add a second pitch type — an offspeed, or a fastball that starts as a strike and finishes as a ball — so the hitter must read movement, not just static location.
3. Add count leverage: two-strike at-bats where the hitter protects a slightly wider zone, and hitter's-count at-bats where they hunt only their damage zone and spit on everything else.
4. Once chase rate holds under target across two blocks, begin also rewarding hard contact on in-zone swings, so discipline and aggression combine.
5. Graduate to fully live, unscripted pitching against a pitcher trying to get them out.

What "done right" looks like

Set a concrete target and hold hitters to it: across a block of 20-plus game-speed pitches, swing at no more than one in four pitches thrown clearly out of the zone — a chase rate at or below 25%. That is a stretch-but-fair bar for developing hitters and lands near the better end of the amateur range. Track it over weeks. The number, not the coach's gut, tells you whether the skill is transferring.

Sources

• MLB.com Statcast Glossary — definition of chase rate / chase percentage.
• FanGraphs — plate-discipline metrics, including O-Swing% (out-of-zone swing rate).
• Driveline Baseball — public research and writing on swing decisions and plate discipline as trainable skills.
• Rob Gray, PhD (Arizona State University) — research and the Perception & Action body of work on pitch recognition and expert batting decisions.
• Journal of Sports Sciences — peer-reviewed research on anticipation and pitch/ball recognition in batting.
• MLB Pitch Smart — pitch-count and rest guidelines for youth pitchers (relevant when a live arm is used).