Pitcher Arm Slots

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In a tip of the hat to this year’s Cy Young winners, I thought it would be fun to look at some things we can learn from how each of these pitchers throw their curveball…

The 'upside down' release of the submariner causes balls to move differently from pitches generated by other arm slots. Gravity plays a significant role, for the submariner's ball must be thrown considerably above the strike zone, after which it drops rapidly back through. The sinking motion of the submariner's fastball is enhanced by forward rotation, in contradistinction to the. No two pitchers are exactly alike. A major reason for this is because everyone has a slightly different release point. For that reason, certain pitches will be more effective for pitchers. I’ll go over the three most common types of release points, as well as which pitches work best for pitcher’s that employ those arm slots and then you can choose which one is best for you High 3/4 (AP.

Arm slots are seldom classified as 'right' or 'wrong.' Each pitcher is going to have a natural arm slot. Some pitchers throw over-hand, some throw 3/4's, and some throw side-arm. Neither of these slots are necessarily right or wrong. There are just as many successful over-hand pitchers as there are 3/4's pitchers. This pitcher demonstrates a higher arm slot that would be around 1:00 on the clock face (if standing behind the pitcher looking towards the catcher). Notice the pitcher’s shoulder tilt which is created by the orientation of his torso. This is what creates the higher arm slot. Now look at the tilt of this pitcher’s shoulders.

Let pitchers throw from their instinctive arm slots. Today, I am going to share a few ideas why I think it is potentially harmful for coaches to try and make all pitchers the same. Walter Johnson, Nolan Ryan, Jake Peavy, Randy Johnson, Dennis Eckersley, Pedro Martinez, the list goes on and on of pitchers who throw from a 3/4 to sidearm arm slot.

NL winner Clayton Kershaw is widely considered to have the nastiest curveball in the game (hard to argue against that). On the other hand, AL winner Max Scherzer is known more for his blazing fastball (along with a great changeup and slider), but credits much of his recent success to having added a curveball to his arsenal… mainly as something that gives him another weapon for keeping lefties off balance.

[h5]High Arm Slot or Low Arm Slot – Which is Best?[/h5]

Rather than going into a lot of detail, examining all the statistics, my goal here is just to take a look at some of the similarities and key differences between how these two pitchers throw their curveballs. And when you look at them, the first thing that jumps out at you is the big difference in their arm slots.

Kershaw is much more that over-the-top, high arm slot guy that most people associate with throwing a nasty 12-6 curveball. Scherzer, on the other hand, has a very low 3/4 arm slot. And this is probably a big reason he’s been more of a fastball, slider, changeup guy for most his career. But what you see with pitchers like him is that, while you probably won’t get true 12-6 break, you can still throw a good curveball without a high arm slot (see Doug Fister).

One mistake a lot of young pitchers make is thinking they need to throw over the top in order to throw a good curveball. And this can lead to all sorts of issues…

Let’s say your natural fastball arm slot is a 3/4 or low 3/4 arm slot. And this is the way your body is used to pitching – it’s been programmed to move, balance and stabilize through your pitching delivery with the exact demands placed on it by that arm slot… What do you think happens if you then change your slot to get on top of your curveball?

You end up with a loss of balance in your delivery, instability and timing issues.

Not to mention that hitters can pick up on it because the pitch is coming out of a completely different window than your fastball. The thing to remember when it comes to throwing a good curveball is that it’s all about hand position and wrist position. That and getting over the ball with a strong middle finger will get you that good downward break on the ball.

Arm

Bottom line: There’s no one right arm slot that’s best for every pitcher. Go with what comes naturally and works best for YOU!

Okay, enough talk… Let’s take a look at those curveballs!

[h4] Clayton Kershaw’s High Arm Slot Curveball[/h4]


Not much to say about this one – the hitter’s reaction says it all…

One of the things that makes Kershaw’s curve so effective, again, is that he throws it from the same slot as his fastball. He’s not trying to manipulate the ball by doing something totally different with his hand and arm action. He gets on the side of the ball and finishes it off by getting over it with a strong middle finger.

One special note: Despite how devastating his curveball is (hitters have batted less than .100 against his curve it the last 2 seasons), Kershaw only throws it 12.5% of the time. It’s a put-away pitch, something he uses to finish guys off and get out of jams. And having that good curveball in his back pocket makes his fastball that much more effective – hitters have to respect it.

Rule #1 for throwing a good curveball: Always develop a good fastball!

[h4] Max Scherzer’s Low Arm Slot Curveball[/h4]

With the curveball shown from behind the mound, notice how Scherzer was able to get that good downward action on the ball. The view seen on the next pitch, from behind the plate, isn’t really his best curveball (he’s actually a little late getting on the side of the ball), but you can see how he manages to get over the ball with his middle finger to get enough forward rotation and downward break.

Bottom line: it’s not as nasty as Kershaw’s 12-6, but having a good curveball has helped Scherzer go from being a very good pitcher to being one of the best in game. Here’s an excerpt from an interview he did this summer with MLB Network:

Kenny: If you could pinpoint one thing that made you go from above-average to great, what would it be?

Scherzer: It’s for me to be relying on the curveball this year. Left-handed hitters have always had a lot of success off me in the past, and it’s because I’ve always been fastball/change-up to ’em, which allows them to sit on just two pitches. Something I tinkered with last year, of developing a curveball to disrupt the timing, I’ve gotten better at this year, so that I can be more consistent with it. And I really feel like I have a good three-pitch mix, to face left-handed hitters, and I feel like that’s why I’m having so much more success.

Note: avoiding the problem of being “late” with the curveball is one benefit of learning the right way to throw it early on – the older you get, the tougher it is to get used to throwing it with good hand and wrist position.

For more advanced Curveball Training you’ll find everything you need inside the Curveball Mastery System

CLEVELAND — Josh Hader’s fastball is the most dominating pitch of its type in recent baseball history. And it’s a complete mystery.

The Milwaukee Brewers reliever has struck out an absurd 50 percent of batters faced this season.Through Sunday’s games.

'>1 For a single season in the pitch-tracking era,Since 2008.'>2 only two pitchers have posted higher rates: Aroldis Chapman at 52.5 percent in 2014 and Craig Kimbrel at 50.2 percent in 2012.

But what’s perplexing about Hader’s whiff rate is that hitters know what’s coming: He is going to throw his four-seam fastball. Hader turns to his signature pitch on 88.6 percent of his throws, a greater frequency than all but two MLB pitchers to have thrown at least 20 innings this year. While the pitch’s velocity (95.9 mph) is above average, it ranks just 66th among fastballs. By comparison, Chapman’s fastball averages 98.2 mph, which is sixth-best in the league.

Hader also owns a below-average total spin rate, as calculated by Statcast’s TrackMan Doppler radar component. The average spin rate for a four-seam fastball this year is 2,284 revolutions per minute, while Hader’s is a rate of 2,154 rpms. Moreover, fastballs — even mid-90 mph iterations — are generally pitches that produce some of the lowest swing-and-miss rates in baseball.

Yet batters are whiffing on 44 percent of their swings against Hader’s fastball, the top mark in the majors.Among pitchers who have thrown at least 50 four-seam fastballs, according to Baseball Prospectus.

'>3 Another 40 percent of swings against his fastball are fouled off — meaning that an opponent is able to put a ball in play just 16 percent of the time he swings at a Hader fastball. Opponents are batting just .132 against the pitch.

Since 2008, when pitch-tracking systems were up and running in all major league parks, Hader owns the greatest career swing-and-miss rate of any pitcher on four-seamers (38.7 percent) with at least 500 fastballs thrown.

Hader’s fastball is something of a ghost pitch: It’s very difficult to hit but not for any of the usual reasons. So what makes it so effective?

Players who have faced him may have some insight. Dodgers infielder Max Muncy, who is 0-for-5 with four strikeouts in his career against Hader, told FiveThirtyEight that Hader’s arm angle makes all the difference.

“When he’s releasing the ball, it’s almost underneath his armpit, and so when he has a high-spin fastball from that angle, it really does look like it’s coming from the ground up,” Muncy said. “And then he’s throwing 97, 98 [mph] so it’s just very, very hard to get on top of that fastball.”

Muncy is right about Hader’s angle: Among lefties to have thrown at least 100 four-seam fastballs by July 14, Hader had the fourth-lowest release point but the 11th-greatest average velocity, according to Baseball Savant data.

But what about Muncy’s contention that Hader has a high-spin fastball? After all, Hader’s total fastball spin is below average. And less spin should mean less of the force in physics known as the Magnus Effect, which pushes up on a fastball, giving it the appearance of rising.Though it’s really just dropping less than a fastball with less spin.

Pitcher arm slots'>4 Yet Hader does get an unusual amount of vertical movement, or rise, on his fastball — about 10 inches of itBaseball Prospectus adjusts for gravity by removing gravity-related movement from pitch movement totals.'>5 — suggesting that Magnus force is pushing up on the ball. And the rise is coming from an unusually low arm slot for such vertical lift.

The explanation may be his spin efficiency.

There are two types of spin: transverse spin, which is sensitive to Magnus Effect and is what makes breaking balls curve and fastball rise, and gyroscopic spin or bullet spin, which is what makes footballs fly in a spiral and is not affected by Magnus force. The problem with using Statcast’s raw spin total to evaluate pitches is that it combines both types of spin. What a pitcher cares about when trying to create movement on a pitch is his efficiency — or how much of his total spin is transverse spin.

To create perfect, 100 percent spin efficiency, transverse spin requires an axis perpendicular to the direction of velocity, while gryo spin moves parallel to that direction. (Again, think a football spiral.)

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High spin efficiency likely explains Hader’s amount of vertical movement despite his low total spin. It suggests that the majority of Hader’s spin is transverse spin — which would explain the vertical movement. That’s why he can blow his fastball right by the best hitters in the game even when they know it is coming, even when it’s thrown right over the plate.

But creating such spin efficiency and vertical rise from such a low arm slot is unusual. Pitchers with lower arm slots typically release a ball with a more vertical axis that creates more side spin, like a sweeping slider from a lower arm slot. That’s in contrast to over-the-top motions that typically create an axis more parallel to the ground given the nature of their hand position.

For example, Chris Sale throws an average four-seam fastball from nearly the same arm slot (5.45 feet above the ground) as Hader (5.19 feet). But Sale’s pitch is thrown with a 126-degree axis, while Hader’s is thrown with a 147-degree axis, according to Brooks Baseball estimates, putting Hader’s axis closer to level.Spin axes pulled from TrackMan are estimates.

'>6 Consequently, Sale has some of the greatest horizontal movement in baseball on his four-seam fastball, while Hader enjoys more vertical movement than Sale does. Hader’s movement is more similar to some over-the-top pitchers.It’s important to note that estimated spin axis doesn’t tell the entire story, as two pitches could have the same axis as measured in degrees in two dimensions, but because they operate in three dimensions, one axis could be oriented more parallel toward home plate (which would create more spin efficiency), and another more perpendicular (which would create more gyro spin). Their pitch axes would measure the same in two-dimensional estimates, but their pitch efficiencies would be different.'>7

For context, Blake Snell has the fourth-highest release point for a four-seam fastball in the majors among lefties, owns a 160-degree spin axis on the pitch (more level) and ranks sixth among all lefties in vertical movement (10.5 inches). Despite Hader’s much lower release point, their fastballs move in a similar way. In essence, Hader has Sale’s release point but Snell’s fastball. Somehow it seems that Hader is able to release a ball with an over-the-top grip and/or wrist position from a side-arm slot.

“Normally that arm slot is going to create a different spin angle,” Muncy says of Hader. “That’s what makes him unique. He’s able to generate backspin from that arm slot that’s what creates such a huge advantage for him.”

What might also be helping him — and is more difficult to measure and quantify — is deception. Hader’s delivery can look like a whirl of skinny flailing arms and legs, and all that commotion can fluster opposing batters. If the opposing hitter needs a fraction of a second longer to pick up the ball out of the delivery, it’s an advantage for the pitcher.

Hader told FiveThirtyEight that when he entered pro baseball, he weighed only 135 pounds.

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“For me as a young guy, just being very small, I needed all the help I could to get my arm to throw faster and harder,” Hader said of his funky delivery.

Some coaches in his amateur career and early in his pro career suggested that he change his awkward throwing motion, but the Orioles (who drafted him) and later the Brewers each had Hader undergo biomechanical evaluations, which found that his mechanics place below-average stress on his elbow and shoulder.

“This just came naturally for me,” Hader said. “I think everyone is different. Everyone has a different type of arm slot and feel.”

As for explaining his success?

“I think it’s a little bit of everything,” Hader says.

Pitcher Arm Slots

Different Pitching Arm Slots

It all adds up to an offering that has become one of the most unhittable fastballs of the pitch-tracking era.

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