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The Seattle Mariners lack impact on the mound in the organization — though it’s not entirely void of it — but they do have depth and some long-term upside plays. Such talents are reflected in this set of rankings.

MORE: Prospects Rankings Nos. 31-50

Friday: Nos. 16-20
— Rankings
— Abbreviated report

Saturday: Nos 11-15
— Rankings
— Abbreviated report

Sunday: Nos. 6-10
— Rankings
— Abbreviated report

February 10: No. 5
— Rankings
— Abbreviated report

February 11: No. 4
February 12: No. 3
February 13: Nos. 1-2
— Rankings
— Abbreviated Report

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February 14: Why 1 over 2
— The differences in the Top 50

February 16: The Next Group
— Which prospects are on the brink of the Top 50

Here are Nos. 21-30 in reverse order, including their best tool, and 2020 projected starting assignment.

30 Brayan Perez LHP 19 CB West Virginia (A)
29 Art Warren RHP 27 FB Seattle
28 Damon Casetta-Stubbs RHP 20 SL West Virginia (A)
27 Sam Delaplane RHP 25 CB Tacoma (AAA)
26 Jonatan Clase CF 17 RUN Arizona (R)
25 George Feliz CF 17 FIELD DSL (R)
24 Wyatt Mills RHP 25 FB Tacoma (AAA)
23 Yohan Ramirez RHP 25 FB Seattle
22 Aaron Fletcher LHP 24 FB Tacoma (AAA)
21 Joey Gerber RHP 23 FB Tacoma (AAA)
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Jason A. Churchill

Churchill founded Prospect Insider in 2006 and spent several years covering prep, college and pro sports for various newspapers, including The News Tribune and Seattle PI. Jason spent 4 1/2 years at ESPN and two years at CBS Radio. Find Jason's baseball podcast, Baseball Things, right here.