Regression is a funny word. It has developed a negative connotation, probably because it is most often used to describe players who are over-performing their advanced metrics, and who are expected to regress down to their expected performance levels. But regression can work both ways. It can be the usual decline in numbers, but it can also talk about a potential improvement in numbers.
Last year we spent a lot of time talking about "regression" when it came to Jeff Locke, and we've taken the same approach on this site whenever any pitcher has a BABIP, strand rate, and/or HR/FB ratio that suggests he won't continue putting up strong numbers. So it's only fair to point out regression in the other sense, when a player is under-performing his numbers.
The problem with this kind of regres...
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