Inspired by this tweet from Marty Lurie, I looked into Miguel Tejada's O-Swing% data. Unfortunately, Fangraphs only has O-Swing% data from 2002-2010, so I couldn't get a good sense of what his O-Swing% was like in his earliest years as a ballplayer. Nevertheless, I was intrigued by his trend. From 2002-2010, he steadily began to swing at a higher percentage of pitches outside the strike zone. I was curious as to whether this is a league-wide trend, so I looked into it.I took a sample of 35 ballplayers (I know, small sample size...but accumulating all of this data was quite tedious...) and plotted the data (their O-Swing, and their respective age). For all of the players, the trend seemed to hold true. They didn't all of steady increase, like Tejada, but they all had a gradual increase...

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