- 24 years old – (HiA Bakersfield / Double-A Jackson)
- 29th round – 2014
- Herb saw his first action as a starter in 2015 with LoA Clinton and the results were to be expected….174 hits in 139.2 innings with 95-52 strikeout to walk ratio. This didn’t stop the Mariners to promote Herb to Bakersfield and then Jackson join 2016. He had better results, but still gave up too many free passes (3.5 BB9).
- 23 years old – (LoA Clinton / HiA Bakersfield)
- 23rd round – 2015
- Warren is another arm that saw a full workload after only making 6 appearances in his 2015 pro debut. A polished college arm had no problem handling the hitter at LoA Clinton, going 9-1 with a 2.19 ERA. Things got messy at HiA Clinton, as he faltered toward the end of the season working exclusively from the bullpen.
- 20 years old – (DSL Mariners)
- International Free Agent – 2014
- 19 years old – (LoA Clinton)
- 2nd round – 2015
- 20 years old – (Short-Season Everett / LoA Clinton)
- International Free Agent – 2012
- The Mariners top left-handed pitching prospect.
- *Postscript: After I scheduled this to post, the Mariners traded Gohara to the Atlanta Braves for couple of UTR Alumni…..OF Mallex Smith and RHP Shae Simmons. Mallex Smith was gone shortly after to the Tampa Bay Rays for Drew Smyly, along with UTR LHP Ryan Yarbrough.
- 21 years old – (DSL Mariners / AZL Mariners)
- International Free Agent – 2013
- With the departure of Gohara, Suarez moves up the list. I refrained from tagging him as a “Legit UTR”. I’ll go out on that limb into the 2017 season.
- 23 years old – (LoA Clinton / HiA Bakersfield)
- 10th round – 2015
- Marked improvements with an increase of his K9 and decreasing his BB9 rates. The standout stat would be his 90% LOB rate,
- 21 years old – (LoA Clinton)
- 36th round – 2015
- 23 years old – (HiA Bakersfield)
- International Free Agent – 2010
- Recently added to the Mariners 40-man roster, Vieira just nudged Joey Strain for last relief spot.
Under The Radar Minors 