曲球
曲球（Curveball）棒球中的一种球路。握球时食指与中指握在球的外侧缝线处，出手时借着手腕的顺时针方向旋转与手指的向下施力，使球造成旋转，进而产生垂直向分力，加上重力的作用，会使球在进入本垒板前的垂直掉落幅度远大于快速球。曲球于1870年代首次出现，是相当古老的一种变化球。
An animated diagram of a 12-6 curveball
参考
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维基共享资源上的相关多媒体资源：曲球 |
- Version 1: Candy Cummings was the inventor of the curveball
- Version 2: Fred Goldsmith: co-inventor of the curveball or pitcher who gave first recorded demonstration of the curveball?
- Aerodynamics of a Curveball in Navier-Stokes Flow （页面存档备份，存于）
- How to Throw a Curveball （页面存档备份，存于） – wikiHow page outlining technique
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