Beginner

ポップアップ(打撃)

Also known as: pop-up, sky ball

Definition

ポップアップとは、極端なバックスピンと非常に急な打球角度(50度以上)を伴う打球のことで、ほぼ真上に上がり、ほとんどの場合アウトになる。

ポップアップは、バレルがボールの中心より下でコンタクトすること、すなわち下降するスイングパスがボールの下3分の1を捉えることで生じる。ポップアップ率の高さは、アンダー気味・オーバー気味のスイングパス、ロード時の低い手の位置、ゾーンを通過する際のバレルの急な落下、あるいは投球の高さに対して下向きすぎるアタックアングルと強く相関している。ポップアップはほとんどヒットにならないため、打撃成績の中でも最もダメージの大きい打球パターンの一つだ。ポップアップ率を下げることは、打率の向上と一貫して相関している。

Beginner tip

During tee work, set the tee at shoulder height and practice keeping the barrel parallel to the ground through the contact zone rather than driving the barrel down at the tee — parallel barrel paths at shoulder height produce the flat-to-slightly-upward approach that eliminates most pop-ups.

Advanced note

Compare your pop-up rate data on high fastballs versus low changeups — if pop-ups cluster on high pitches but not on low ones, your load position or attack angle is the cause. If they occur across all pitch heights, the barrel path angle is the issue and requires different corrective work.

Example

彼女はファストボールを3球連続でポップアップさせた。映像では、バレルがゾーンを鋭く下降し、ボールの赤道より下でコンタクトしていることが確認できた。

Why it matters

A steep, dropping bat path causes pop-ups long before the pattern shows up in your statistics. Motion Lab estimates your attack angle from your arm movement, so you can work on the path before the results confirm the fault.

How it shows up on video

On video, pop-up mechanics are visible in the angle of the barrel relative to the ground at the contact point. A barrel that arrives at a steep downward angle will almost always make contact below the ball's equator. Common error signatures include the back shoulder dropping significantly lower than the front shoulder at contact (creating a severe tilted plane that drives the barrel under the ball), the barrel tip pointing toward the ground at contact rather than remaining on the pitch plane, and the hands finishing above the head in the follow-through (indicating the barrel drove severely upward after undercutting the ball).

Common mistakes

Dropping the back shoulder sharply in an attempt to "lift" the ball. This paradoxically causes the barrel to undercut the ball more severely and produces higher pop-up rates than a flatter swing would
Setting up with low hands at load. This forces the barrel to travel upward to reach the high-pitch contact zone and produces steep undercutting contact on fastballs in the upper third
Confusing the launch angle goal (positive launch angle, ideally 10–25 degrees) with the barrel path approach angle (which should match the pitch plane, not arc upward toward it)
Over-correcting for a ground ball problem by exaggerating upward barrel angle. This shifts the contact window from the ball's equator to below it and trades a ground ball pattern for an equally problematic pop-up pattern

In SwingVantage Motion Lab

Motion Lab estimates your attack angle and swing-plane tilt from your arm movement. It does not track the ball or the pitch height, so it cannot link a swing to a pop-up; check the result on video.

Open Baseball in Motion Lab