Introducing blog -- How to use this blog

Hello. Welcome to my blog. 


I am 21 year old korean student who loves baseball.

I've been writing Korean baseball blog since I was a highschool student. 

I felt the need to write in English as well, so I started this blog.

At first, I'll translate writing that I wrote on my old blog. 

And after I translate all of them, I'll also post new writings as well. 

So, enjoy this blog and if you have any questions, contact my email : lgtwins0305@gmail.com


Thank you

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Arm angle and Pitcher type

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Danny Young New York Mets pitcher Danny Young’s Baseball Savant movement profile is as follows. He throws a sinker and a sweeper with significant horizontal movement from a low arm angle. He’s a pitcher with an interesting pitch mix. It’s clear that he confuses hitters more with differences in horizontal movement between pitches rather than vertical movement. Horizontal vs. Vertical Movement Differences This gave me an idea. I looked into which pitchers have the greatest differences in horizontal movement and which in vertical movement when pairing their pitches two by two. As previously seen, Danny Young falls into the former category. The image above shows the movement profile of Cubs pitcher Caleb Thielbar in 2020. Unlike Danny Young mentioned earlier, he features a four-seam fastball and curveball combination from a high arm angle. He falls into the latter category, characterized by a large difference in vertical movement. Based on data from 2020 to 2025 for pitchers who faced at l...
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The Relationship Between Pitch Location Scatter Plots and Arm Slot

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During the last offseason, I was looking at a scatter plot of Cleveland pitcher Tanner Bibee’s pitch locations, and it reminded me of a regression line with a negative slope. I had a similar thought after watching Aaron Nola’s knuckle curve location. However, the slope of Nola’s regression line is more gradual than Bibee’s. While this may be the result of various factors—such as the trajectory and usage of breaking balls, as well as command—I focused on something a little different: arm slot. Nola’s average arm slot is 20 degrees, whereas Bibee’s is 51 degrees. And arm slot does have some correlation with pitch movement. I looked into the relationship between pitch location scatter plots and arm slots. Here’s how: •   I plotted pitch location scatter plots for pitchers who threw more than 100 pitches of each pitch type. •   From these scatter plots, I drew regression lines and calculated the location correlation coefficients for each pitcher. •   Then, I compared the corr...
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Randomness of Pitcher

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 The legendary Major League pitcher Warren Spahn once said, “Hitting is timing. Pitching is upsetting timing.” This statement perfectly captures the essence of both pitching and hitting. A pitch that disrupts a batter’s timing is one that is difficult to react to. So, what kind of pitches are hard to react to? It could be an extremely fast pitch, or a very slow one. But more importantly, it could be a pitch that’s difficult to predict. In this article, I use entropy to simply calculate the randomness of Major League pitchers. Method 1 Here’s how I calculated randomness: I calculated the entropy of each pitcher’s pitch usage rates by pitch type. Then, I normalized each pitcher’s entropy score between 0 and 1 to obtain a “pitch usage entropy score.” The more pitch types a pitcher uses, and the more evenly they’re distributed, the higher this score becomes. I selected every pair of pitch types a pitcher throws (for  n  pitch types, there are nC2 combinations), calculated the...
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