Mariners Prospects: Jonny Farmelo is already making Seattle's farm system even stronger

After a lost 2024 season that saw him sidelined with a torn ACL, Seattle Mariners outfield prospect Jonny Farmelo returned to the field in 2025 with a thunderous reminder of his elite potential — crushing a home run in his very first at-bat.

It was a great moment to see for the 2023 draft pick, who had spent over a year rehabbing and watching from the sidelines as other names in Seattle’s stacked farm system surged ahead in the spotlight.

While Farmelo quietly battled back from injury, prospects like Lazaro Montes, Colt Emerson, and Michael Arroyo turned in electric 2024 campaigns, stealing headlines and climbing prospect rankings. Montes mashed his way into national attention with prodigious power, Emerson’s polish and advanced approach turned heads, and Arroyo’s bat started to flash some serious power despite his youth.

In the midst of their rise, Farmelo — viewed as a cornerstone in the Mariners’ next wave of elite, high upside prospects — began to fade into the background. But that may not last long.

Mariners prospect Jonny Farmelo returns from injury and is ready to break out in 2025

Farmelo’s upside remains among the highest in the entire Mariners system. A dynamic athlete with a strong left-handed bat, excellent speed, and center field defense that projects as above average, Farmelo offers a tantalizing all-around profile.

His power-speed combo is legit, and his feel for hitting was praised even before the injury. He flashed his immense upside and five-tool talent in 2024, slashing .264/.398/.421 with four home runs and 18 stolen bases in just 46 games. If he can stay healthy and continue to develop his approach at the plate, the ceiling is sky-high — a potential five-tool outfielder in the making.

The early signs in 2025 suggest he’s ready to reassert himself. The homer in his first plate appearance wasn’t just symbolic; it was a statement. After months of his draft mates and prospect peers dominating headlines, Farmelo is back in the conversation — and if he keeps swinging the bat like this, he may soon force his way to the top of it.