引用:
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作者DSI
可是我請教朋友卻是中指  我當初也覺得是食指，因為slider是要往右邊下切，我還跟他確認好幾次。
查網頁也是說食指或反轉手腕，改天我遇到他再確認一次，請他實際投投看  |
Fastball
http://en.wikipedia.org/wiki/Sinker_%28baseball%29
Sinker
A sinker is a pitch in which the ball is spun so that it drops suddenly as it reaches the plate. Besides making the ball harder to hit, the downward motion also makes contact with the ball more likely to result in a ground ball.
A sinker can also be known as a sinking fastball. It is thrown with a two-seam fastball grip. Besides sinking down, the sinker can have tailing movement
by applying more pressure to the index or the middle finger.
兩位看一下 Wiki是說有食指中指出力都可以
可能要看投手的習慣吧