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蝴蝶球

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大联盟著名的蝴蝶球投手提姆·韦克菲尔德

蝴蝶球(英语:Knuckleball,knuckler),又称指关节球不旋转球棒球中的一种球路,是一种特殊变化球,球速不快,其重点在于尽量减少球在飞行运程中的旋转,造成球出现不稳定、无法预测的运动。投球时,挥臂不必非常用力,主要是靠着手臂与身体投球的惯性把球推出去,不是用手指弹出的弹指球。由于推出去的球几乎不会有旋转,再加上气流流过缝线的作用,所以会在剥离层产生相当多的紊流,因此造成球体表面有压力差,球会有轻微的左右与上下飘动,就如同飞舞的蝴蝶,故名为蝴蝶球

在美国大联盟百年历史当中,总共有70多位蝴蝶球投手,球的握法只有2种,是用指尖(几近垂直)扣著球,包括2指尖扣著球与3指尖扣著球,再用其他剩下的手指把球握住。

投这种球,对投手的控球能力是很大的挑战,对于要接球的捕手来说,也是很困难的。在美国大联盟球队中,蝴蝶球投手通常都会搭配一名专属捕手,捕手的手套也比较大。

代表投手

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蝴蝶球
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