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POSTED: 6-11 — Three arms, a speedy outfielder, and the catcher
POSTED: 11-20 — Upside and heat
POSTED: 21-30 — Highlighted by young CF, relief help
POSTED: 31-40 — Five Arms and power upside

Thursday: No. 4
No. 3
Saturday, Feb. 27:
No. 2
Sunday, Feb. 28:
No. 1
Monday, March 1:
Best Tools
Tuesday, March 2:
How many Mariners prospects would be No. 1 elsewhere?
Wednesday March 3: 
Projected 2024 Lineup, Rotation, Bullpen

5. Noelvi Marte, SS
As Marte has  added strength and now looks the part of a corner bar with plus power. While it’s not out of the question he sticks at shortstop — I’d put the chances at 10-15% — most signs point to the 19-year-old eventually moving to the hot corner where his plus arm, good footwork and projectable range fit the hot corner well.

He’s still a ways away, but there’s a lot to like about Marte’s ability to get the bat head out front, use the middle of the field, and cover the zone both vertically and horizontally. The bat speed is plus and he generates natural leverage.

The swing is free and easy and he’s developed a better two-strike swing since signing nearly three years ago, including simplified usage of his lower half. As a result, Marte’s ability to stay back on soft stuff, yet trust his hands suggests advanced hitting skills and a projectable hit tool.

While I’m not quite as bullish on the hit tool as some, at lest not with so little experience and no live look for yours truly, I do buy the raw power and its chances to reach beyond plus levels and eventually show up in games, and from right-center to the left-field line.

Marte projects to play everyday, likely at third base, and hit 20-30 home runs with above-average batting averages and on-base marks. Since he’s still maturing physically, the power grade is a bit fluid, and he may end up merely an average runner despite being scouted a burner at 16.

He’ll likely start 2021 in Modesto to work on making more consistent contact versus better pitching. There’s a chance he earns his way to Everett this summer.

Considering at least two of the club’s Top 5 prospects project to graduate in 2021, Marte likely ends the season in the Top 3. It’s not out of the question he’s the club’s No. 1 prospect by July, and a Top 40 prospect in baseball by September.

ETA: 2023


CEILING: David Wright
Bill Hall
Willy Aybar

As Marte gains experience, advances through the minors and becomes more skill-oriented rather than a tools-based prospect, his floor and median comps will increase in value, though both are relatively high considering his lack of experience at timeline.

Marte’s ceiling comp could get better, too, specifically in the power department. Among the most optimistic and aggressive comps I’ve heard this winter include Matt Williams, Adrian Beltre, and Alex Bregman.


55+ 60+ 50 60 50+ 53

6 George Kirby RHP 2023 COMMAND A+/AA
7 Taylor Trammell LF 2021 HIT AAA/MLB
8 Cal Raleigh C 2021 POWER AAA/MLB
9 Brandon Williamson LHP 2023 FASTBALL A+/AA
10 Isaiah Campbell RHP 2023 FASTBALL A/A+
11 Juan Then RHP 2022 FASTBALL A+/AA
12 Zach DeLoach CF 2023 HIT A+
13 Jonatan Clase CF 2025 RUN A/A+
14 Austin Shenton 3B 2022 HIT AA
15 Sam Carlson RHP 2024 FASTBALL R/A
16 Andres Munoz RHP 2021 FASTBALL AAA/MLB
17 Connor Phillips RHP 2023 FASTBALL R/A
18 Levi Stoudt RHP 2023 FASTBALL A/A+
19 Jake Fraley OF 2021 HIT AAA/MLB
20 Milkar Perez 3B 2024 HIT R/A
21 Ljay Newsome RHP 2021 COMMAND AAA/MLB
22 Anthony Misiewicz LHR 2021 CURVEBALL MLB
23 Will Vest RHR 2021 FASTBALL MLB
24 George Feliz CF 2025 HIT R
25 Braden Bishop CF 2021 FIELD AAA/MLB
26 Yohan Ramirez RHR 2021 SLIDER AAA/MLB
27 Joey Gerber RHR 2021 FASTBALL AAA/MLB
28 Adam Macko LHP 2024 CURVEBALL A/A+
29 Wyatt Mills RHR 2021 FASTBALL AAA/MLB
30 Sam Delaplane RHR 2021 CURVEBALL AAA/MLB
31 Carter Bins C 2023 FIELD A+/AA
32 Alberto Rodriguez OF 2024 HIT A
33 Aaron Fletcher LHR 2021 SLIDER AAA/MLB
34 Kaden Polcovich 2B 2023 HIT A/A+
35 Damon Casetta-Stubbs RHP 2024 FASTBALL A/A+
36 Michael Limoncelli RHP 2025 CURVEBALL R
37 Kristian Cardozo RHP 2026 CURVEBALL R
38 Starlin Aguilar OF 2026 POWER R
39 Tyler Keenan 1B 2023 POWER A/A+
40 Taylor Dollard RHP 2023 CHANGEUP A
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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.