Dallas Braden and the screwballby Mike Fast
May 14, 2010
If you haven't been hiding under a rock for the past week, you probably know that Oakland Athletics pitcher Dallas Braden threw a perfect game against the Tampa Bay Rays on Sunday, May 9. It was an outstanding achievement and a fascinating story, one that has been ably covered by many other writers.
|Dallas Braden throws a circle change-up to Willy Aybar in the ninth inning of his perfect game. (ZumaPress, via PicApp)|
I, however, was particularly fascinated by one question.
Braden was known as a screwball pitcher coming up through the minor leagues, but after shoulder surgery in 2006, he abandoned the screwball because of injury concerns and because he developed an effective circle change-up, as reported by Athletics Nation.
Nico: There have been reports over the years that you weren't throwing your screwball anymore, that you had never thrown a screwball, that your screwball and change-up were the same pitch called different things, so this is my chance to try to clarify: What is the deal, past, presen, and future, with Dallas Braden and the idea of throwing a screwball?
Braden: In the past, it was absolutely a screwball. I did not throw a breaking ball—a traditional left-handed slider or curve ball—so I had to add another pitch that was going to create a little more depth, less velocity, and that's where the screwball came into play. I had arm trouble and then it was eventually shut down in '05 and needed arm surgery and coming back from surgery I just didn't feel comfortable using the torque right away and so I stayed away from the screwball, and then coincidentally afterwards I pitched in Winter Ball and worked on a breaking ball in Winter Ball, got the invite to big league camp in '06 and '07.
(But) showcasing the screwball, the screwball really wasn't there for me because I was babying it—I was scared to throw it, I didn't want to get up on top of it—and Curt (Young) felt strongly enough and had enough confidence in my change-up to go ahead and just bag the screwball, let's just focus on the slider. And you know what? Because I had such a good feel for the change-up, I could kind of tweak it, make it do different things, versus just trying to throw a traditional change-up, so we went that route and now I don't throw the screwball. I have variations of (the change-up)—different counts to different hitters, I've got a real good command, a real good feel for it.
I have not seen any evidence in the PITCHf/x data that Dallas Braden has thrown any screwballs in the major leagues, at least not until his perfect game. His career roughly corresponds with the PITCHf/x data collection era (2007-2010). We don't have data for every single pitch Braden has thrown, and I may have overlooked something, so it's possible he's thrown a screwball or two before, but it's certainly not a pitch he has used in the majors on a regular or even semi-regular basis.
So I was very intrigued to read the following from Braden via Susan Slusser after his perfecto:
In the sixth, Kapler had the best at-bat of the day against Braden, who needed 12 pitches before getting him to hit a foul pop toward third.
"I was thinking maybe the knuckleball, the gyroball, the behind-the-back pitch, because I'd tried everything else," Braden said. "I threw him a 64 mph screwball and he fouled it off. I threw him one more pitch and it was the correct location."
Can we see any evidence of the screwball in the PITCHf/x data? In fact we can. While we're looking for it, let's also compare Braden's circle change-up to two other off-speed pitches from left-handed pitchers: the screwball of Danny Ray Herrera and the circle change-up of Cole Hamels.
First, look at the difference in speed and in the spin they put on the ball. The following graphs, courtesy of Trip Somers and TexasLeaguers.com, show some characteristics of the trajectories of the pitches thrown by Herrera, Braden and Hamels. The different pitch types, as classified by MLB Advanced Media, are shown in different colors. I've added a red circle to each graph to indicate the screwballs and change-ups of interest.
Herrera's screwball is thrown around 65 mph, and he actually has a separate change-up that he throws about 75 mph. He has quite a bit of topspin on the screwball due to pronating his wrist/forearm (twisting it the opposite way compared to the curveball and slider), which can be seen in the spin axis angle of around 50 degrees or so. (A spin axis of less than 90 degrees means the ball has topspin, like a curveball from a right-handed pitcher.)
Here we see that Braden's circle change is thrown around 70 mph. You can also see the one slower pitch there at 64 mph that he called a screwball. The spin axis on his circle change is around 130 degrees, whereas the "screwball" had a spin axis of 100 degrees.
Hamels' circle change is thrown harder, around 80 mph. It has a spin axis similar to Braden's, at around 130 degrees.
The effect of the spin can be seen more apparently if you look at the spin deflection of the pitches. This is how much the spin on the baseball moves the pitch up and down or left and right. These graphs are shown from the catcher's viewpoint. Again Herrera is first, Braden second, Hamels third.
The spin on Herrera's screwball makes it drop about six inches on average. That's partly due to his lower release angle but also due to pronating his wrist/forearm to get additional topspin on the ball.
The spin on Braden's and Hamels' change-ups make them rise by about seven to eight inches. That's why Braden's change-up is not a screwball. Now, the one "screwball" that he threw rose only an inch or two due to spin. Is that a true screwball? I would say probably not in terms of how it moved. But it is more screwgie-ish than his other pitches, so I wouldn't argue too much with him about the name.
What makes Braden's circle change-up look like a screwball to some people when Hamels' similar change-up doesn't look that way is that Braden throws it 10 mph slower. That gives gravity a lot more time to act on the ball and makes it drop a lot more. This corresponds better to what the batter or other observer sees when he watches the pitch. He may not know how it was gripped or was spinning, but he can see it dropping.
Here are the previous graphs with the effect of gravity added in:
Between the slow speed and screwball spin, Herrera's screwgies drop between three to four feet over the last 40 feet of their travel. That's a drop similar to a Barry Zito curve.
Braden's circle changes drop about two feet on average over the last 40 feet of their trajectory, and the "screwball" dropped about three feet.
Hamels' circle changes, because they are thrown harder, drop only about 15 inches over the last 40 feet of travel, even though they have the same spin as Braden's circle changes.
Now back to the question of whether Braden threw a screwball to Gabe Kapler. That pitch is different than his circle change-ups. However, it's not unheard of for a pitcher to vary his pitches a little bit. Without the quote from Braden, I'd be skeptical of that as a screwball based on the data (spin angle > 90 degrees, i.e., no topspin). With the quote from Braden, I certainly accept that he thew what he considers a screwball. And that counts for quite a lot. If I had to call that pitch something, I suppose I'd call it a screwball, too, but not without some reservation. It's enough different than Herrera's screwballs that I'm loathe to consider them as part of a single entity.
I have often wished that we had good data on more screwball pitchers than Herrera. Unfortunately Jim Mecir retired after 2005, before we had PITCHf/x data, and we haven't had anyone but Herrera since. Does anyone know of any screwball pitchers currently in the minor leagues?
References and Resources
PITCHf/x data is courtesy of MLB Advanced Media and Sportvision. PITCHf/x graphs are courtesy of Trip Somers and TexasLeaguers.
Mike Fast is a Royals fan who enjoys investigating baseball questions using data of many sorts. He is a member of Complete Game Consulting. He welcomes comments via e-mail.
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