2021 Organization Report: Seattle Mariners

(Photo: Julio Rodríguez, OF)

To familiarize yourself with the process of creating this 2021 prospect lists in the times of COVID-19, be sure to read our 2021 Organization Report Pandemic Primer. As stated there, we draw heavily on our 2020 Org Reports.

 

2021 Organization Report: Seattle Mariners

RankPlayer NamePOS20 levelGradeETA
1Julio RodríguezOFALT9C2021
2Jarred KelenicOFALT9C2021
3Noelvi MarteSSALT9C2022
4Logan GilbertRHPALT8C2021
5Emerson HancockRHPALT9D2023
6George KirbyRHPALT8D2022
7Brandon WilliamsonLHPALT8E2022
8Juan ThenRHPALT8E2023
9Isaiah CampbellRHPALT8D2022
10Levi StoudtRHP-7C2023
11Jake FraleyRHPMLB7C2019
12Cal RaleighCALT7C2021
13Taylor TrammellOFALT7C2021
14Sam CarlsonRHP-8E2023
15Zach DeLoachOFALT7E2023

New players to the Top 15 in...

Almost!

You’re just a few clicks away from accessing this feature and hundreds more throughout the year that have a singular goal in mind: Winning your league. Subscribe to BaseballHQ.com here!

Already a subscriber? Sign in here

More From Org Reports

Our prospect lists for 2026 — Organization Reports for each of the 30 MLB clubs — are back this week! Here's a primer on what to expect for the next six weeks.
FREE
Dec 1 2025 3:01am
Led by Ethan Holliday and Charlie Condon (pictured) the Rockies farm system offers a few glimmers of hope for the future.
Jan 6 2026 3:03am
The cupboard is nearly bare, though there are a few dynamic arms that offer promise over the long-term.
Jan 5 2026 8:22am
After promising debuts in 2025, the Athletics have more youngsters on the rise.
Jan 2 2026 3:03am
RHP Tyler Bremner and OF Nelson Rada (pictured) leads a farm system with lots of interesting arms and few interesting bats.
Jan 2 2026 3:01am
What the Astros farm system lacks in top talent, they make up for in average MLB pieces—such as former top pick Brice Matthews.
Dec 31 2025 3:03am

Tools