Most radar guns read the ball just as it leaves the pitcher’s hand so it’s very possible for a 2 seam and 4 seam to read exactly the same. The difference should occur as the ball is travelling to the plate. I think that for some individuals the 2-seamer is just faster than the 4-seamer. So if you son gets more velocity and movement on a 2-seamer, work on that. He throws mainly a 2-seamer as his fastball instead of a 4-seamer. He’s succesful with what works for him and it should be like that for every individual out there.
Many pitchers, especially those without exceptional velocity, prefer a two-seam fastball to the four-seam because of its movement at the plate. However, power pitchers such as Justin Verlander combine control, high velocity, and break to make the two-seamer one of the most effective pitches in baseball. The arm action is identical to a four-seam fastball, although the hand action differs slightly. Typically, the two-seam has more movement if the pitcher applies index fingertip pressure, or holds the baseball deeper in the hand.
Speed is naturally a very important part of pitching, if not the most important. You might think that the more seams visible in a fastball’s rotation, the more the ball will move; however, it isn’t so. The rotation motion in four-seam fastballs is quite straight, and the ball won’t have much spin. If you’re a baseball player or interested in it, you might know that there are 4 seam and 2 seam fastball pitches that get their names from the pitching style and rotation of the ball.
Here are some pictures of different two seam fastball grips… The 2 seamer is a pitch thrown much like the 4-seamer but with different finger placement and with a different function. It is called a “two seam” because when thrown, the pitch only has two seams cutting through the air towards the target. This allegedly causes the ball to move more but also a hair slower. In this article, you’ll learn everything you need to know about throwing a two-seam fastball that goes beyond “dirty” or “nasty” and usually involves embarrassing the batter…
Once your index finger is comfortable with the grip, you can progress into spinning a baseball to a partner without any trouble. The arm action on this pitch is a little abbreviated at the end. Instead of getting a nice long arc of deceleration and finishing throwing elbow outside of your opposite knee , you’ll want to bring your throwing-hand elbow to the opposite hip.
Both techniques cause the ball to spin out of the hand off-center and away from the pitcher, similar to the spin of a changeup. As expected, Giolito’s increased arm angle led to more vertical movement and less horizontal movement. This increase in vertical movement was partly responsible for his jump in swinging strike rate with the other part being his 2 MPH increase in fastball velocity. This increase can be attributed to Giolito’s offseason training which involved throwing weighted baseballs and his mechanical work with the Rapsodo camera, which caused him to shorten his arm stride . Both of these methods are proven to increase velocity while simultaneously reducing the arm stress created from throwing thousands of pitches each year. Most good slider pitchers grip the outer-third of the baseball and cock their wrist slightly, but not stiffly, to their throwing hand’s thumb-side upon release of the pitch.
In the first two articles, we talked about how pitch selection, location, and velocity can all impact the swing and miss ability of different pitches. We saw how velocity clearly makes a difference when it comes to the success of 4-Seam fastballs as long as the pitch is thrown high over the plate. However, guys like Aroldis Chapman, Noah Syndergaard, and Ken “100 Miles” Giles all throw triple-digit high heat but don’t appear on any of the high fastball success leaderboards in the previous articles. Well, this likely means that there is more to fastball success than just location and velocity. To get this pitch to be effective and run the way it’s supposed to, you should place slightly more pressure on the index finger than the middle finger.
This pitch has very late down movement which makes this pitch to lay off of. Depending on the pitcher, some will throw a change-up that has a little depth, and some just float it in there and rely on the change in speed, and the similar spin for effectiveness. If the ball moves wiffle ball strike zone to the pitchers arm side and doesn’t have any depth, than the ball runs. This is why I recommend that you spend a few weeks – preferably during the off-season – working on tucking your index finger into the baseball. Do it while you’re watching TV or in study hall at school.