The Seattle Mariners didn’t have much depth in their farm system as it was in terms of high-level pitching prospects.

And now their highest-ranked pitcher, 19-year-old right-hander Sam Carlson, announced he will undergo season-ending Tommy John Surgery to repair his right elbow, and he could miss much of the 2019 season, as well.

Thanks to everyone who has reached out to me, surgery went well and I can’t wait to be back on the field

— Sam Carlson (@samcarlson33) July 3, 2018

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