Mariners' best young hurler recently got promoted (and it's not the switch-pitcher)

Chicago White Sox v Seattle Mariners | Alika Jenner/GettyImagesThe Seattle Mariners continue to showcase their strong track record of developing young pitching talent, and the latest example is the promotion of Ryan Sloan to High-A Everett.

At just 19 years old, Sloan is proving to be one of the most polished young arms in the organization, demonstrating a maturity on the mound well beyond his age. In his first full professional season, he is solidifying himself not only as one of Seattle’s most important prospects, but as a rising name across all of baseball.

Sloan entered the system with plenty of promise, but few could have predicted how quickly he would establish himself as a cornerstone…