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# Jonny Farmelo — Mariners Prospect Profile
- URL: https://baseballthings.com/jonny-farmelo-mariners-prospect-profile/
- Published: 2026-09-13T03:23:00.000Z
- Updated: 2026-09-29T06:58:42.000Z
- Description: Mariners center fielder, No. 4 in the September 2026 rankings. Scouting reports, development notes and level-by-level analysis from Jason A. Churchill.
- Author: Jason A. Churchill
- Tags: Jonny Farmelo

Farmelo rebounded some after his own struggles following the promotion to Double-A, raking in September. He's a potential five-tool player, with four of them almost certain to play in the majors.

Injuries have shaped this profile more than anything Farmelo has done at the plate. He played 46 games in 2024, his season ending on June 11\. He played 29 in 2025, a year split by a 78-day absence between May 23 and August 9\. Across those two seasons he came to bat 350 times — development reps that simply did not happen, at the ages when most players are banking them. Then 2026: 129 games, 613 plate appearances, nearly double the previous two years combined, and a level climbed in the middle of it. He has roughly one full season of professional at-bats behind him. Everything below sits on top of that.

The Double-A line looks worse than it was. Farmelo hit .267/.386/.477 with 13 home runs in 399 trips at High-A, then .222/.355/.358 after moving up on July 21 — but that produced a 105 wRC+, which is to say he was still a better-than-average offensive player at the level while batting .222\. August was the actual bottom: .194/.339/.258 across 115 plate appearances without a home run.

[Luke Stevenson — Mariners Prospect ProfileMariners catcher, No. 3 in the September 2026 rankings. Scouting reports, development notes and level-by-level analysis from Jason A. Churchill.![](https://storage.ghost.io/c/f2/85/f285ce72-40e3-409f-ae3b-2ef371936c02/content/images/size/w256h256/2026/08/BT27Logo1024width--1-.png)Baseball ThingsJason A. Churchill![](https://storage.ghost.io/c/f2/85/f285ce72-40e3-409f-ae3b-2ef371936c02/content/images/2026/09/Luke_Stevenson.png)](https://baseballthings.com/luke-stevenson-mariners-prospect-profile/)

September is where your read holds up. Over the final 11 games he hit .302/.412/.535 with two homers and a .233 isolated slugging, cutting his strikeout rate to 23.5% from 29.4% across the rest of the Double-A stint. It is 51 plate appearances, which is a caveat and not a dismissal.

Through all of it the strike zone never moved. He walked 15.8% of the time on the season and 16.4% after the promotion — the rate went up at the harder level — and even in that homerless August he walked 17.4% of the time. That is what held the wRC+ above average when nothing was falling.

There is a detail worth sitting with. His strikeout rate rose from 24.6% at High-A to 28.0% at Double-A, but his swinging-strike rate did not move at all: 12.1% to 12.2%. He was not missing more often. He was taking more strikes, which is a different problem and a more fixable one. For context, that same rate was 16.2% during his injury-shortened 2025.

The quietest development is on the bases. Farmelo stole 41 bases, but the split tells it: 26 for 40 at High-A, a 65% success rate that costs a team runs, then 15 for 16 at Double-A. He became a basestealer inside one season, against better catchers.

The power is the tool that actually showed up. Farmelo slugged .477 with a .210 isolated slugging and 13 home runs in 399 High-A plate appearances in his age-21 season — a rate that prorates past 20 over a full season — and he did it in the first year he had been healthy long enough to build one. He also pulled the ball more than he ever had, 47.7% on the season against 41.1% in 2024, which is what it looks like when a hitter starts turning on pitches rather than surviving them. The Double-A sample cooled it, four home runs and a .136 ISO in 214 trips. That is a first look at a level in the same season he set a career high in workload by a wide margin, not evidence against the tool.