This is an excerpt from the Joe Sheehan Baseball Newsletter, an e-mail newsletter about all things baseball, featuring analysis and opinion about the game on and off the field from the perspective of the informed outsider. Joe Sheehan is a founding member of Baseball Prospectus and a contributor to Sports Illustrated and Baseball America. He has been writing about baseball for more than 20 years.
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"Who else is under a spotlight this week? Well, Corey Kluber hasn’t lost his fastball quite as rapidly as Sale has, but over two seasons his four-seamer has gone from 93.1 to 92.4 to 92.0, and his bread-and-butter pitch, the two-seam fastball, from 93 to 92.4 to 91.8. He hasn’t been getting the same amount of sink he did on the two-seamer as he did at his peak, either. I was wary of Kluber in the offseason, and will be watching his start in Detroit tomorrow carefully. Kluber’s five-year peak measures up to any of his peers, but at 33, we may be seeing the start of the decline phase."