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The Math Behind Hard Contact by Rob Crews

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The Math Behind Hard Contact | Complete Game

The Math Behind Hard Contact
RC
Complete Game • 8 min read
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Every pitch has a specific angle that must be hit to barrel it up. It's really just mathematics playing out at contact points.

When I talk to hitters about making adjustments, most of them think in terms of "inside" or "outside" — horizontal location. But elite hitters are processing something far more nuanced. They're adjusting their vertical bat angle based on pitch location, and they're doing it instinctively.

Let's break down what that means.

What Is Vertical Bat Angle?

Vertical bat angle is simply the angle of the bat at contact, measured from horizontal.

  • A perfectly flat, level swing (horizontal baseline)
  • ~-32° A flatter angle, typical for opposite-field contact
  • ~-45° A steeper angle, typical for pulling inside pitches

"Different pitch locations require different angles."

The Statcast Evidence

Look at Mike Trout's data. When he pulls the ball on inside pitches, his vertical bat angle is closer to -45°. When he goes the other way on outside pitches, it flattens out to around -32°.

 
Mike Trout's Vertical Bat Angle Range
~-45°
Pulled Balls
~-32°
Oppo Field
~13°
Adjustability

That's roughly a 13° difference — and that difference is what separates elite adjustability from one-dimensional hitting.

Same hitter. Different angles. That's what makes him elite.

Pitch Location Rules

Here's the framework:

 

Vertical Plane

Higher pitches → Flatter angle
Lower pitches → Steeper angle

 

Horizontal Plane

Outside pitches → Flatter angle
Inside pitches → Steeper angle

The Extremes

Steepest Angle Required
Low + Inside
Closer to -45°
Flattest Angle Required
High + Outside
Closer to -32°

Every Pitch Has Three Dimensions

This is where it gets interesting. Every pitch has three dimensions your hitter must process:

  • 1

    Vertical Plane

    Is it high or low?

  • 2

    Horizontal Plane

    Is it inside or outside?

  • 3

    Depth

    Where should contact occur? (In front of the foot, even with the foot, or deeper)

Elite hitters process all three dimensions and adjust their vertical bat angle accordingly. Average hitters only think about one or two.

Why Posture Comes First

Here's the coaching takeaway that matters most:

"You can't create the mathematics if you don't have the right posture."

Try this: Stand completely upright and attempt to create a -45° bat angle at contact. You'd have to contort your body unnaturally to make it happen.

Now try it with a 10-15° forward lean toward the plate. Suddenly, the full range of vertical bat angles becomes available to you.

Posture gives you the ability to be adjustable and adaptable. Without it, you're limited to a narrow range of pitches you can actually barrel up.

The Coaching Application

When I work with hitters, I'm not thinking "swing down" or "swing level." I'm thinking about whether they have the postural freedom to create the angle each pitch location demands.

If a hitter keeps popping up outside pitches to the pull side, they're probably bringing a steep angle (-45°) to a pitch that requires a flat angle (-32°). The fix isn't mechanical — it's postural. Give them the freedom to adjust, and the adjustment happens naturally.

 

Key Takeaways

  1. Vertical bat angle is the angle of the bat at contact, measured from horizontal
  2. Different pitch locations require different angles
  3. Inside and low pitches require steeper angles (closer to -45°)
  4. Outside and high pitches require flatter angles (closer to -32°)
  5. Posture enables adjustability — without it, you can't create the angles
  6. Every pitch has three dimensions: vertical plane, horizontal plane, and depth

The Bottom Line

The math is there. The question is whether your hitters have the postural foundation to execute it.

Eyes lead the body. Body leads the barrel. And posture makes the math possible.

Ready to Develop Elite Adjustability?

Work with Complete Game to build the postural foundation your hitters need.

RC

Rob Crews

Founder of Complete Game, a player development company specializing in perception-action training and data-driven hitting instruction. Author of "Complete Game" and "SWAG 101," and host of the podcast "Transcending Sport with Rob Crews."

 

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