How do you throw a sinker in baseball?
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Brandon Webb and Roy Oswalt are perfect examples. Watch video of Webb pitching and you'll see his 2-Seam/Sinker have a pretty dramatic dip at the end (which is why many call his a sinker), where the same pitch from Oswalt runs in at right handed batters (which is why his is still refered to as a 2-seam).
Now that that's taken care of, how to throw it.
A 2-Seam/Sinker is thrown with index and middle fingers along and over the narrow seams, thumb underneath on the horseshoe seam. To get more sink than running action, you have to throw it hard and low in the zone with a good downward angle (if you get under the ball at release, it won't sink). Some pitchers move one or both fingers slightly inward from the seams to get more sinking action. One version, which some people call the "Little League Sinker," actually has the fingers together in the middle of the smooth cover between the narrow seams. This pitch usually drops sharply but is slow and difficult to control. If you have good arm action, the basic 2-seam grip should give you all the sink you need. Just a few of inches of sink on a 2-seamer will yield many ground balls. Experiment with variations on the basic 2-seam fastball grip and see what works for you.
Here's a good site that will show you the 2-Seam as well as several other pitches.
http://www.thecompletepitcher.com/pitchi...
**Note** A sinker is NOT an off-speed pitch, and should not be used as one. It is a fastball with movement. A sinker's success comes from the fact that the hitter can not tell the difference between it and a normal fastball. If you can switch between your sinker and 4-seam in fastball counts (mostly sinkers low in the zone, 4-seams up in the zone) hitter's will have an extremely hard time centering your fastball. If they're never sure which fastball they're seeing they won't be able to hit it square and you'll get pop-ups and ground balls all day.
Hope I've helped, good luck.
It's easier than you might think. (overhand delivery)
1)Hold the ball with the seams instead of across them
2)Apply a little pressure to the bottom of the ball with your thumb
This will reduce the 6-12 spin. Also, be aware that using your thumb will reduce velocity a little, but that's ok. If you use the same arm speed as your fastball, the difference in speed will be negligible and the drop will be just enough to get your double play ball.
Going further. Take a little off of it. You now have a terrific off-speed pitch that sinks alot more. You'll get some K's out of it, but you'll get a ton of weak ground balls to 3rd base
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