发球上网
Also known as: 发球上网战术, 发球截击, 进攻型发球战术
发球上网是一种战术打法，发球员在发球出手之后立即冲向球网，意图用第一或第二记截击终结这一分。
发球上网曾是1980年代到1990年代初快速场地上的主流职业打法。发球员借助发球收拍动作的动量向前冲刺，理想情况下在接发球员触球时执行split step，逼近到发球线内侧的截击站位。成功与否取决于:一记限制接发球员角度的落点良好的发球、一次时机精准的split step，以及可靠的冲击式截击。在较慢的场地上，球员有更多时间打穿越球突破网前球员，这正是这套战术在红土和大多数硬地场地上基本消失的原因。它至今仍是一件有效的出其不意武器，也是双打的主要打法风格。掌握发球上网需要出色的截击直觉、精准的发球落点，以及在压力下执行split step的勇气。
发球上网的几何关系是自我强化的。一记把接发球员拉出场外的宽角切削发球，会缩小接发球员从其站位出发可用的穿越角度——发球员朝T点方向逼近，会自然覆盖住剩余的角度。一记打向身体的发球会顶住接发球员，产生一记短的防守型回球，很容易从第一次截击的位置就被终结。一记T点发球则会产生一记居中的接发球，能从一个舒适的第一次截击站位向任一方向改变方向。在每一种情况下，发球落点都在这一分开始之前，就决定了第一次截击的难度。
双打中的双人发球上网——网前的两名搭档都在发球员发球后一同冲向网前——是这套战术最极致的表现。在双打中，网前站位的主导地位如此显著，以至于发球上网在各个水平的竞技比赛中基本上都是必需的。未发球的一方站在发球区T点，在发球出手时逼近，两名球员一同到达网前。两名球员组合起来的网前覆盖范围，让穿越球和挑高球都变得极其困难，这正是为什么双打的分数通常比单打更短、更具进攻性。
Tips by skill level
Try serve-and-volley behind wide slice serves only. The returner is stretched wide and has the toughest angle for a passing shot. This gives you the most forgiving conditions.
Vary serve-and-volley with an occasional stay-back point on the same serve pattern — once the returner starts chipping short expecting your net rush, the short ball becomes an easy forehand winner from the baseline.
Example
发球宽角打向发球方场地，球员立即向前冲刺，在接发球员挥拍时split step，把一记反手截击打成角度球，第一拍就干净利落地赢下这一分。
Why it matters
Serve-and-volley shortens rallies and puts returners under time pressure. Motion Lab does not track serve placement, so check on video whether your serves set up the approach before you commit to the tactic.
How it shows up on video
Look for forward momentum in the serve follow-through transitioning directly into the approach sprint. On video, check that your split step is timed to the opponent's contact and that you volley from inside the service line. Errors appear as the player stopping at the baseline after serving, not splitting, or arriving at the net too slowly and hitting a defensive volley from the service line instead of an offensive position.
Common mistakes
- Pausing at the baseline after the serve instead of immediately sprinting forward, arriving too deep for an effective first volley
- Not splitting before the opponent makes contact, arriving at the net stationary and unable to react to passing angles
- Using serve-and-volley behind a weak serve that gives the returner too much time and too many angles to work with
- Approaching on the second serve without the spin quality to limit the returner, turning a risk into an almost certain passing opportunity
In SwingVantage Motion Lab
Motion Lab does not track your court position or distance from the net. Check on video where you make first-volley contact: from an effective closing depth or from too far back in the court.
Frequently asked questions
我可以在休闲网球中使用发球上网吗?
可以，尤其是作为一种出其不意的套路。用一记宽角切削发球或一记有力的T点平击发球来限制接发球员的角度，随后迅速逼近并执行split step。每盘哪怕只有一两次上网逼近，也会改变接发球员的行为方式。
Related terms
- 截击技术截击技术是指在球落地之前将其击出的机制，使用短促、稳固的冲击动作，而不是完整的底线球挥拍。
- 上网进攻上网进攻是指球员在打出过渡球或发球之后，主动从底线向球网移动的战术决定，目的是用一记截击或高压球终结这一分。
- 分腿垫步分腿垫步(split step)是一次与对手击球瞬间精确同步的小跳，它能让你的双腿蓄力，随时准备朝任何方向爆发性蹬地。
- 平击发球平击发球是以最小的旋转、最大的拍头速度击出的发球，能产生三种主要发球类型中最高的球速，但容错空间也最小。
- 切削发球切削发球通过擦刷球的外侧产生侧旋，让球飞离右手发球员的发球方一侧对手，并在弹跳后保持低平。
- 底线打法底线打法是一种从场地后方掌控得分的战术风格，通过深远、稳定的底线球来调动对手、创造机会，而不上网。
- 场地站位场地站位是指球员在两次击球之间所处的位置，随着每一次击球不断调整，以最大限度覆盖对手最可能的回球，同时最小化防守漏洞。
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