隧道点
Also known as: 投球隧道点, 决策点
隧道点是指投球飞行轨迹中的某一点——大致是打者必须决定是否挥棒的那一点——在这一点之前，两种不同球种的轨迹几乎完全重合，之后才开始分道扬镳。
打者判断是否挥棒的时间窗口固定且极短，大约在球飞行了投手板到本垒板一半左右距离的那一点。两颗出手点、臂速和初始轨迹在这一决策窗口内完全一致的投球，被称为“隧道化”——打者此时还无法分辨它们。真正把两种球路区分开的，是隧道点之后发生的事：快速球继续直行，而滑球向手套一侧变化，或者变速球只是比外观相同的快速球更晚到达。
两种球路的隧道效应越紧密——它们在分道扬镳之前，沿相同视觉路径飞行的距离越长——制造的挥空或软弱击球就越多，因为打者是在信息不完整的情况下做出决定的。隧道效应最重要的决定因素是出手点的一致性；如果一名投手的快速球和滑球明显来自不同的手臂角度或出手高度，就会给打者提早露出破绽，让隧道效应还没来得及发挥作用就已破功。
Example
录像叠加显示，他的滑球和快速球在前25英尺沿着完全相同的路径飞行才开始分道扬镳，如此紧密的隧道效应让滑球出手瞬间几乎无法辨认。
Why it matters
隧道效应是最能通过录像验证的欺骗性指标之一——SwingVantage可以把同一局出赛中不同球种的出手点和早期飞行轨迹叠加对比，展示一套武器库的隧道效应究竟有多紧密。
How it shows up on video
On video, a well-tunneled pair of pitches shares the same release point, arm speed, and early trajectory. A poorly tunneled pair shows visibly different release heights or an arm-speed change that telegraphs which pitch is coming before the tunnel point is even reached.
Common mistakes
- Throwing pitches from subtly different release points without realizing it, which gives hitters an early read before the tunnel point
- Changing arm speed between fastball and off-speed pitches, destroying the tunnel regardless of how similar the pitches look on paper
- Focusing only on individual pitch shape and ignoring how two pitches look together out of the hand, which is what tunneling actually measures
In SwingVantage Motion Lab
SwingVantage Motion Lab compares release-point coordinates and early trajectory across different pitch types from the same outing, flagging when a breaking ball or changeup diverges from the fastball's path earlier than intended.
Frequently asked questions
隧道点和隧道效应是一回事吗？
两者密切相关——隧道效应描述的是多种球路共享飞行路径所产生的整体效果，而隧道点是这条路径上打者必须做出决定的那个具体位置。
Related terms
Related guides & benchmarks
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