触垒起跑（接杀后触垒）
Also known as: 触垒, 重新触垒, 牺牲高飞推进
触垒起跑是指跑垒员在高飞球被接杀时返回并触碰自己所在的垒包，然后向下一垒起跑——这是在高飞球被接杀后合法推进的方式。
当高飞球被击出时，跑垒员必须在球被接住之前待在自己的垒包上（触碰垒包）。外野手一碰到球，他们就可以起跑推进。顶尖的触垒跑垒员会在脚保持接触垒包的同时观察外野手的眼神和身体语言，然后在球接触手套的瞬间立即爆发起跑。对于外野的牺牲高飞球，三垒上的跑垒员几乎总应该触垒起跑。对于较浅的高飞球，外野手的深度、跑垒员的速度以及外野手的臂力，都会影响触垒起跑能否成功多推进一垒。
Position your foot on the inside corner of the bag. This means closest to the base you are advancing toward. This means before the pitch is delivered. As a result, when a fly ball is hit you are already in the optimal push-off position without needing to reposition.
Practice watching the ball into the outfielder's glove from a tagged-up position in particular by having a partner track fly balls in the outfield. At the same time, you stand with your foot on the bag and call "catch!" the instant you see glove-ball contact. This means this trains the precise timing discipline that separates tag-up masters from average baserunners.
Example
他在三垒上对一记飞向中外野、深度适中的高飞球触垒起跑，轻松得分——他对外野手站位的判断告诉他，传球会来不及。
How it shows up on video
On video, tag-up quality is measured by the runner's foot position on the bag at the moment of catch, the direction the body is facing. The explosiveness of the first step off the bag. Common errors include the runner having both feet flat on the ground rather than positioned on the bag in a ready-to-push stance, the body facing the outfield rather than angled toward the next base. The runner losing contact with the bag for an instant before the catch. This means which creates a retouch obligation that negates the advance.
Common mistakes
- Leaving the bag too early before the ball is caught. This means even a tenth-of-a-second early departure is a legal violation that results in an out if appealed by the defense
- Standing flat against the center of the bag rather than on the inside corner with the body angled toward the next base, losing the push-off position advantage that fast taggers use to gain an extra step
- Making the tag-up decision based on the depth of the fly ball alone without considering the outfielder's arm strength, throwing angle. The presence or absence of a cut-off play
- Not watching the ball all the way into the outfielder's glove. This prevents precise timing of the departure. This means watching the fielder's glove make contact is the signal that must be seen before the departure step
In SwingVantage Motion Lab
SwingVantage measures foot position on the bag at the catch frame and timing of the first departure step relative to the catch contact frame, identifying early departures and measuring the body angle at departure. The system computes a tag-up efficiency score based on departure timing and initial step direction, benchmarked against the runner's historical best.
Related terms
Related guides & benchmarks
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