M’s Notebook: High performance camp players picked; AFL update

The Seattle Mariners on Wednesday announced the 36 players who will be a part of their high performance camp.

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The group is made of 22 position players and 14 pitchers. It includes 14 of the 18 players the Mariners signed from their 2026 draft class and three players from their 2026 international free agent class. And it also features 18 of the players ranked among the Mariners’ top 30 prospects by MLB Pipeline.

Among the most notable names picked for the high performance camp are shortstop Felnin Celesten, catcher Luke Stevenson, third baseman Ace Reese, outfielder Yorger Bautista and left-handed pitcher Mason Peters.

Announcing this year’s High Performance Camp roster!

Things are underway in Arizona as players continue to sharpen their skills and improve their game. #TridentsUp pic.twitter.com/OXfUDlAq7n

— Mariners Player Development (@MsPlayerDev) October 21, 2026

Below is a look at the full list of players. Those in bold are draft picks and international signings from 2026. Those with asterisks next to their names are players ranked among the organization’s top 30 prospects by MLB Pipeline.

• Pitchers

RHP Lucas Kelly*
RHP Colton Shaw*
LHP Mason Peters*
RHP Casey Hintz*
LHP Jack Bowery
RHP Po-Chun Lin*
RHP Nathan Taylor*
RHP Connor Mashburn
RHP Matthew Matthijs
LHP Chris Torres
RHP Isaac Thornton
RHP Christian Little
RHP Jackson Steensma*
RHP Wyatt Queen

• Position players

SS Felnin Celesten*
C Luke Stevenson*
OF Aiden Taurek*
SS Nick Becker*
3B Ace Reese*
3B Henry Ford*
SS Ryan Wynn
OF Jake Brown*
OF Hayden Yost
OF Yorger Bautista*
2B Eric Jeon
3B Trevor Lucas
C Mason Eckelman
OF Kelvin Alcantara
INF Leandro Romero
C Manuel Almeida
OF Juan Rijo*
OF Gregory Pio*
OF Jarvis Gomez*
OF Charlie Sutherland
C Josh Caron
INF/OF Diego Contreras

AFL update

The Mariners sent eight players to play for the Peoria Javelinas in the Arizona Fall League. It’s been a rather quiet showing from the group through the first half of the 30-game schedule.

The biggest name the M’s sent to Arizona was catcher Boston Smith, the club’s 13th-ranked prospect. The 23-year-old Smith, who was acquired from the White Sox in August during the Luis Castillo trade, is batting just .156 (5 for 32) with a .473 OPS, no extra-base hits, eights walks and 14 strikeouts in 10 games.

Brandon Eike, a 25 year old who put together a strong season with High-A Everett this year, is also hitting just .229 (8 for 35) with a .594 OPS, two doubles, four walks and nine strikeouts in 10 games.

Among the five pitchers Seattle sent to the AFL, right-handers Ty Cummings and Adam Smith are having the best showings thus far. Cummings, a 24 year old, has allowed two runs on four hits and two walks while striking out six batters over 4 2/3 innings in five appearances. Smith, a 26 year old, has surrendered one run on two hits while striking out four over 3 2/3 innings over four appearances.

While the Mariners’ prospects in the AFL haven’t made much noise, one player that has for the Javelinas is former M’s prospect Tai Peete. The 21-year-old Peete is batting .341 (14 for 41) with a 1.060 OPS, one homer, three doubles, three triples, six walks and 12 strikeouts in 10 game. Peete was traded to the St. Louis Cardinals in February in the deal that brought Brendan Donovan to Seattle.

Peoria sits in fourth place in the six-team AFL with an 8-7 record through the first half of the schedule. The league wraps up its regular season Wednesday, Nov. 11, and holds its playoffs from Nov. 12-14.

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