一三垒防守
Also known as: 1-3防守, 角落跑垒员
一三垒防守是指当跑垒员同时占据一垒和三垒时使用的一套防守方案，目的是防止三垒跑垒员得分，同时仍努力制造一个出局数。
一三垒局面是垒球中战术最复杂的局面之一，因为进攻方可以在投球时起跑，迫使捕手在传向二垒（冒着三垒跑垒员得分的风险）与拦截传球（在夹杀中抓住跑垒员，但让二垒被盗成）之间做出选择。球队有多种防守指令——拦截传球、放行、假装拦截——正确的选择取决于比分、跑垒员的速度和局数。
Before every pitch with runners at the corners, confirm the defensive call verbally with your teammates. This means knowing the scheme eliminates the hesitation that causes breakdowns at game speed.
Vary your first-and-third calls game-by-game and even within a game. This means using the same scheme on every first-and-third situation allows smart offensive coaches to time your reaction and exploit it with a predictable run.
Example
跑垒员起跑冲向二垒；捕手把球传向游击手的拦截位置，游击手立即转身传向本垒，此时三垒跑垒员正好在传球时起跑，被夹杀在跑垒线上。
How it shows up on video
Film the entire defensive play from a center-field angle to see all four players (catcher, shortstop cutoff, third baseman, first baseman) and track who moves correctly when the runner breaks. A botched first-and-third defense shows the shortstop late to the cutoff position, the third baseman failing to crash on a faked throw, or the catcher making the wrong decision based on the wrong pre-pitch read of the defensive call. Communication — visible in pre-pitch gestures — is the precursor to successful execution.
Common mistakes
- The catcher throwing on its own to second on every steal without reading whether the defensive call was to cut or let the throw go
- The shortstop arriving at the cut position a step late, giving the runner on third too long to evaluate the throw's trajectory before breaking
- Not communicating the defensive call clearly before the pitch, leading to infielders reacting to the play rather than executing a pre-decided scheme
- The offense successfully reading the defense's default call and exploiting the same first-and-third scheme repeatedly in the same game
In SwingVantage Motion Lab
Motion Lab provides frame-by-frame breakdown of a first-and-third play for each defender's position and movement timing. This helps coaches identify which defensive player broke down in a failed execution.
Frequently asked questions
对年轻球员来说，最安全的一三垒防守是什么？
直接拦截方案——游击手接到传球后立即回头盯防三垒跑垒员——简单、能降低风险，并给年轻内野手一个清晰的决策路径。
什么时候应该让传球直接传向二垒，而不是拦截它？
当三垒跑垒员起跑很慢时，当冲向二垒的跑垒员速度很快、盗垒会产生影响时，或者比赛局势（比分接近、局数较晚）让二垒的出局数比防止得分更有价值时。
Related terms
Related guides & benchmarks
Put this into your swing
SwingVantage can spot this in your own swing — free to start.
See a sample Fast-Pitch Softball report first