A Look at Marcus Semien and BB%+K% Change

Since I did not own him on any of my fantasy teams in 2019, I was not aware of the incredible season Marcus Semien was having until it was almost over. His WAR of 7.6 was a career high and good for 5th best in the MLB. Almost two weeks ago Grey, the lead writer of Razzball.com, posted the recap of the top 20 SS of 2019. In standard 5×5 leagues, the Razzball player rater had Semien as the sixth best shortstop for fantasy this season. In past years, it might not mean much, but this year there were a lot of productive players at the position so ranking sixth was no small feat. In his recap of Semien’s season, Grey provided an interesting tidbit I will quote below: “His Ks dropped from 18.6% to 13.7% and walks went up from 8.7% to 11.6%. Ready for some wonky math? Great! Almost 5% down on Ks and 3% up on walks, so that’s 8% total difference. I wonder what the highest percentage difference is for a player in 2019 who had at least 2500 previous major league at-bats. I have to think Semien’s close to the best, or edging near.” Normally when writers pose these type of questions, I think about answering them, but never do. However, that day I decided to do just that on my lunch break. This article details my journey to answering this question. Did I successfully complete it? Was Grey right? Keep reading to find out. How about that for a cliff hanger?

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