The keys to know and follow in the Mariners farm system for the second half

MiLB.comThe Mariners will spend the next couple weeks attempting to augment their roster and maintain their playoff position. They will have to do so with a farm system viewed universally as one of baseball’s thinnest. With just two weeks until the trade deadline, Seattle faces the difficult task of improving, by and large, with what they’ve got. With that in mind, I wanted to highlight a few players and storylines that will be most impactful for the Mariners’ organization in the second half of 2018. I settled on ______

Can any position players earn a call-up this year?

The Mariners had plenty of call-ups in 2017, but nearly every one was by necessity, not through a prospect forcing the front…