This is a preview of 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 nearly 25 years.Your subscription gets you the newsletter and various related features two to five days a week, more than 150 mailings (more than 200,000 words) a year full of smart, fun baseball writing that you can't find in the mainstream. Subscribers can also access the new Slack workspace, to talk baseball with me and hundreds of other Newsletter subscribers.
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"For 2021, it’s a transition. The Mariners have brought in some veteran ballast for the rotation, but they have to learn what they have in Justus Sheffield and Justin Dunn and Logan Gilbert. Is Kyle Lewis an everyday center fielder or the fourth man when the three prospects get here? What the heck was that last year from Evan White? Within those questions is how you get to thinking of this as a surprise team. The Mariners have the highest upside of these seven teams, and enough 'yes' answers here can help them realize it. I don’t think they get there, but even as I write this graf, I’m wavering. Why not, indeed?"