Mariners promote prospects, make several releases in sweeping MILB moves

The Seattle Mariners made a sweeping series of moves in their farm system on Monday, which included some top prospects moving up a level and a number of players being released from the organization.

The most notable players moving up are 21-year-old outfielder Jonny Farmelo and 20-year-old shortstop Felnin Celesten, who have been promoted to the Double-A Arkansas Travelers from the High-A Everett AquaSox. Farmelo is the No. 60 overall prospect in baseball and No. 5 prospect in the M’s system, per MLB Pipeline, while Celesten is No. 70 overall and No. 6 for Seattle.

MLB's No. 73 prospect Jonny Farmelo goes oppo for his first homer of the season at High-A!@Mariners | @MsPlayerDev | @EverettAquaSox pic.twitter.com/w2LPEDxa9g

— MLB Pipeline (@MLBPipeline) April 5, 2026

The news of Celesten’s promotion was first reported Sunday. The promotions of Celesten and Farmelo come just weeks after Seattle promoted two other highly-ranked prospects, infielder/outfielder Michael Arroyo and outfielder Lazaro Montes, from Arkansas to the Triple-A Tacoma Rainiers.

A look back at your Northwest League Player of the Week, Felnin Celesten 🔥 https://t.co/rjzaZTySIO pic.twitter.com/mKxYpCfOP0

— Mariners Player Development (@MsPlayerDev) April 28, 2026

Four other prospects ranked in Seattle’s top 30 by MLB Pipeline received promotions: right-handed pitcher Charlie Beilenson (No. 24) goes to Tacoma from Arkansas, Lucas Kelly (No. 27) goes from Everett to Arkansas, and outfielders Korbyn Dickerson (No. 11) and Aiden Taurek (No. 28) go to Everett from the Single-A Inland Empire 66ers.

Six players were released from Mariners affiliates on Sunday and Monday combined. Catcher Brian O’Keefe, utility player Alejo Lopez and outfielder Colin Davis were let go from the Triple-A Tacoma Rainiers, while infielders Hogan Windish and J.T. Arruda and pitcher Abdiel Mendoza were released from Arkansas.

O’Keefe played 10 MLB games for the Mariners between 2022-23 and Lopez saw time from 2021-23 with the Cincinnati Reds. Windish (2022) and Davis (2021) were both seventh-round MLB Draft picks by the Mariners. Arruda was an 11th-round pick by the Washington Nationals in 2019, and Mendoza was a 2015 international free agent signing by the Athletics who pitched for Panama in the 2026 World Baseball Classic. Both Arruda and Mendoza were minor league signings by Seattle in January.

The Mariners also transferred the rehab assignment of All-Star utility man Brendan Donovan to Everett from Tacoma on Tuesday, with the AquaSox set to play at home this week against the Eugene Emeralds while the Rainiers will be on the road against the Reno Aces. Donovan played Friday and Sunday for the Rainiers as he works his way back from a left groin strain.

Here’s a list of the Mariners’ sweeping moves in the minor leagues Monday.

Promoted to Triple-A Tacoma

Players promoted from Double-A Arkansas

• C Nick Raposo
• LHP Reid VanScoter
• RHP Charlie Beilenson

Touching down in Tacoma  ✈️

Nick Raposo, Reid VanScoter and Charlie Beilenson have been promoted to Triple-A. pic.twitter.com/7jss7xAyec

— Mariners Player Development (@MsPlayerDev) July 20, 2026

Promoted to Double-A Arkansas

Players promoted from High-A Everett

• C Josh Caron
• SS Felnin Celesten
• OF Jonny Farmelo
• RHP Lucas Kelly

Another round of promotions on the farm!

Felnin Celesten, Jonny Farmelo, Josh Caron and Lucas Kelly are heading to Arkansas 👏 pic.twitter.com/gypG5obIAS

— Mariners Player Development (@MsPlayerDev) July 20, 2026

Promoted to High-A Everett

Players promoted from Single-A Inland Empire unless otherwise noted

• SS Ricardo Cova
• OF Korbyn Dickerson
• OF Aiden Taurek
• RHP Pedro De Costa Lemos (promoted from Arizona Complex League Mariners)

On the move ⬆️

Aiden Taurek, Korbyn Dickerson and Ricardo Cova are your newest Everett AquaSox! pic.twitter.com/NgzlSBpMqZ

— Mariners Player Development (@MsPlayerDev) July 20, 2026

Promoted to Single-A Inland Empire

Player promoted from ACL Mariners

• OF Brayden Corn

One more move 📈

Brayden Corn is heading to San Bernardino 🔱 pic.twitter.com/KXn2eEDex4

— Mariners Player Development (@MsPlayerDev) July 20, 2026

Released

• 2B Alejo Lopez (from Tacoma)
• C Brian O’Keefe (from Tacoma)
• OF Colin Davis (from Tacoma)
• 1B Hogan Windish (from Arkansas)
• SS J.T. Arruda (from Arkansas)
• RHP Abdiel Mendoza (from Arkansas)

Other moves

• Mariners 3B Brendan Donovan sent on a rehab assignment to Everett
• 2B Jo Ayama assigned to Inland Empire from Everett
• Everett CF Curtis Washington Jr. transferred from the seven-day injured list to 60-day injured list
• ALC Mariners C Eduardo Ponce activated from the 60-day injured list

Seattle Mariners news and more

• Ohtani may not return to mound in time for M’s-Dodgers series
• ESPN’s Passan believes Cal Raleigh ‘will fix himself’
• Five Seattle Mariners storylines for the second half

Related

Mariners could face old friend Marco Gonzales in Rangers seriesSuárez homers against his former team, Reds beat Mariners 4-2Reds pitcher – a former Mariner – apologizes for outburst at umpireMLB players propose expanded draft eligibility in latest bargaining sessionMariners taking it slow with Julio, J.P. after injury scaresMariners sign first-round pick Ace Reese; 2 draftees remain unsigned