Seattle Mariners Top Dynasty Prospects - July Edition

The division reports debuted last year. The goal of this article series is to provide a quick overview of all dynasty-relevant information from each division. Each team has multiple levels each containing plenty of impactful prospects which can feel impossible to keep up with. This article series, which will be updated once per month, will help dynasty managers stay up to date on performances, injuries, promotions, and more. New this season is the inclusion of tiers in the rankings. Next to their rank, each prospect is assigned a tier. The tier range is 1-5.

Tier 1: A potential difference-making dynasty prospect. Somebody who would rank in the top-20ish prospects for dynasty baseball
Tier 2: A still very good dynasty prospect who holds plenty of value. This prospect would typically rank in the 21-75 range
Tier 3: A mid-tier prospect who could be valuable but has questions and concerns present in his profile ranking in the 76-150 range
Tier 4: A prospect who is worth knowing, but is reserved for deeper leagues. This prospect would rank 151-250
Tier 5: The rest of the prospects fall into Tier 5

This article details all of the changes dynasty managers need to know about prospects from the Mariners. The goal is to help dynasty managers stay updated on the latest information with in-depth looks at each specific team! Each division will come with a monthly update that readers can look forward to.

This list features prospects not currently in the Majors.

Seattle Mariners

Top 10 Prospects

Rank (Tier)	Player	Position	Level	Previous Rank
1 (2)	Colt Emerson	SS	A+	5
2 (2)	Michael Arroyo	2B	AA	6
3 (2)	Lazaro Montes	OF	AA	1
4 (2)	Felnin Celesten	SS	A	3
5 (2)	Jonny Farmelo	OF	A+	2
6 (2)	Ryan Sloan	SP	A	4
7 (4)	Tai Peete	SS	A+	10
8 (4)	Jurrangelo Cijntje	SP	A+	8
9 (4)	Harry Ford	C	AAA	NR
10 (4)	Tyler Locklear	1B	AAA	NR

Notable Prospect Promotions and News

OF Lazaro Montes, SP Jurrangelo Cjintje, and Harry Ford have been selected for the Futures Game. Montes has already surpassed 20 home runs between the two levels this season. Cjintje is a switch-pitcher who is carrying a strikeout percentage in the mid-20s. Ford has debuted briefly, but is hitting over .300 during his time in Triple-A this season.
2B Michael Arroyo and Lazaro Montes have been promoted to Double-A.
OF Jonny Farmelo has been out since late May with a back injury. He is still working his way back to action.

Notable Prospect Performances

A late-month promotion has not slowed down 2B Michael Arroyo. Between High-A and Double-A, Arroyo slashed .322/.446/.644 with 8 home runs in the month of June. He walked just as much as he struck out, 15 times a piece for the month. Arroyo has recovered from his slow start and begun to put up impressive numbers, earning a promotion along with Lazaro Montes. Many of Arroyo’s questions revolve around where he’ll play defensively, which will add pressure to his bat. Still, with his ability to make contact and lift the ball, it appears he’ll be able to withstand that pressure.

Michael Arroyo lasers a game tying home run in the 8th! First HR at Double-A for Arroyo. pic.twitter.com/9faZmxrLI4

— Mariners Minors (@MiLBMariners) June 27, 2025

OF Lazaro Montes was the other prospect to reach Double-A, and that came with his own hot hitting. Over the last month, Montes hit 10 homers with a .253 average. The power surge has continued at the new level. At just 20 years old, Montes is very young for the level, which is a positive sign that he’ll be able to hit enough for his powerful archetype to manifest. His strikeout rate is in the mid-20s, though not high enough to warrant major concern, especially with his walk rate settling in the mid-teens.