knuckleball
电梯球knuckleball#,无旋转,飘忽不定,疑似s球,超级下坠crazy dip
指节变化球
knuckleball!
图片内容是:knuckleball
knuckleball!
【4周达】knuckleball: the history of the unhittable pitch
【2-4周达】the knuckleball club: the extraordina
> ball four: my life and hard times throwing
baseball: from pitch to hits