Mariners Prospect Jonny Farmelo Is Finally Giving Fans A Reason To Believe

With a newfound aggression at the plate, Mariners prospect Jonny Farmelo is turning heads by surpassing his career high in home runs in just one month, signaling a promising trajectory for his MLB future.

Jonny Farmelo keeps turning promise into production, and the latest reminder came in the form of a moonshot to dead center off Jose Atencio of the Angels. The homer was his seventh of the month - a number that stands out all by itself, considering Farmelo had never hit more than six home runs in an entire season before.

For a player whose career has been shaped as much by missed time as by talent, the surge matters. Farmelo, the Mariners’ No. 6 prospect, was selected 29th overall in the 2023 Draft and signed for an over-slot $3.2 million, but he didn’t appear in the months after he put pen to paper.

A torn right ACL then ended his debut season after 46 games. He got back in less than 11 months, only to have a rib cage stress reaction limit him to 29 games in 2025 before he headed to the Arizona Fall League.

Now that he’s finally been able to stay on the field for an extended stretch, the numbers are starting to match the tools scouts have always loved. Farmelo’s line at Single-A in 2024 was .264/.398/.421, he hit .230/.318/.460 at High-A in 2025, and he posted a .234/.406/.442 mark in the Fall League. The difference this year is volume: he’s only missed five games, and that steady run has given his bat room to breathe.

The 21-year-old has also caught fire in June, putting up a 1.041 OPS for the month. He reached base in 22 of 24 games and collected seven multihit efforts, including Tuesday’s. His other hits came in the fifth inning, when he lined a single to right and then stole his 23rd base of the season, and in the ninth, when he shot a ball down the line to bring in the go-ahead run from first.

Farmelo has changed his approach a bit at the plate this season. His swing rate has climbed to 46 percent, right around league average, and while he’s chasing a little more, he’s also making much more contact. His whiff rate has dropped from 35 percent to 29 percent.

That’s still a tough profile to live in at the big league level, but the trend line is moving the right way. When a player is starting to make more contact and keep doing damage like this, the hard-hit balls tend to get your attention fast.

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