Below is a partial list of minor league baseball players in the Seattle Mariners system.

Players Josh Caron

Joshua Howard Caron (born August 3, 2003) is an American professional baseball catcher in the Seattle Mariners organization.

Caron attended Sun Prairie High School in Sun Prairie, Wisconsin, where he played baseball. As a senior in 2021, he batted .438 with eight home runs and 49 runs batted in (RBI) and helped lead Sun Prairie to a state championship. After graduating, he enrolled at the University of Nebraska and played three years of college baseball for the Nebraska Cornhuskers. As a junior in 2024, Caron played in 60 games and hit .308 with 16 home runs and 65 RBI.

After his junior season at Nebraska, Caron was selected by the Seattle Mariners in the fourth round of the 2024 Major League Baseball draft. He made his professional debut after signing with the Single-A Modesto Nuts and batted .277 with one home run across 13 games. He played the 2025 season with the High-A Everett AquaSox with whom he won the Northwest League Championship and hit .197 with nine home runs and 26 RBI over 79 games. Caron returned to Everett to open the 2026 season and was promoted to the Double-A Arkansas Travelers in July. Across 103 games between the two teams, he batted .258/.350/.525 with 22 home runs, 74 RBI, and 28 stolen bases while being caught four times. His 19 home runs with Everett were tied for fifth-most in the Northwest League and his .579 slugging percentage led the league.

Nebraska Cornhuskers bio

Felnin Celesten

Felnin Daniel Celesten (born September 15, 2005) is a Dominican professional baseball shortstop in the Seattle Mariners organization. His nickname is El Fénix.

Celestin signed with the Seattle Mariners as an international free agent in January 2023 for $4.7 million. He did not make his professional debut that year due to a hamstring injury he suffered in June.

Celestin made his professional debut in on May 4, 2024 with the Arizona Complex League Mariners. In 32 games, he hit .352 with 3 home runs and 5 stolen bases. He only played once after June 20, and his season ended in early August after he underwent wrist surgery. He was named the 74th best prospect in baseball by MLB.com before the 2025 season. He started 2025 with the Single-A Modesto Nuts.

Ty Cummings

Ty Brendan Cummings (born November 1, 2001) is an American professional baseball pitcher in the Seattle Mariners organization.

Cummings attended Corinth Holders High School and played college baseball at Campbell University. In 2022, he played collegiate summer baseball with the Bourne Braves of the Cape Cod Baseball League and was named a league all-star. After his junior season, he was selected by the Seattle Mariners in the seventh round of the 2023 Major League Baseball draft. He signed for $225,000.

Cummings made his professional debut in 2024 with the Everett AquaSox. He started 25 games and was 4-5 with a 4.17 ERA and 124 strikeouts over innings. On October 4, 2024, Cummings was traded to the Tampa Bay Rays as the player to be named later in the Randy Arozarena trade. He was assigned to the Montgomery Biscuits to open the 2025 season. He was named the Southern League Pitcher of the Week in April. He also appeared in three games for the Durham Bulls. Over 29 games (20 starts) for the season, Cummings went 8-4 with a 3.29 ERA and 92 strikeouts over 123 innings. Cummings returned to Montgomery to start the 2026 season, now pitching as a reliever, and made three appearances for the team.

On April 24, 2026, the Rays traded Cummings back to the Mariners in exchange for Casey Legumina. The Mariners assigned him to the Arkansas Travelers. Across 37 relief appearances for Arkansas, Cummings went 3-2 with a 6.04 ERA and 45 strikeouts over innings. After the season, he was assigned to play in the Arizona Fall League with the Peoria Javelinas.

Campbell Camels bio

Taylor Dollard

Taylor Joseph Dollard (born February 17, 1999) is an American professional baseball pitcher in the Seattle Mariners organization.

Dollard attended Crespi Carmelite High School in Encino, Los Angeles, California. As a junior in 2016, he went 2-4 with a 3.38 ERA over 12 appearances. As a senior in 2017, he went 2-0 with a 1.43 ERA and 42 strikeouts over innings.College Sports He went not drafted in the 2017 Major League Baseball draft and enrolled at Cal Poly San Luis Obispo to play college baseball.

Dollard made 19 appearance as a freshman at Cal Poly in 2018 and posted a 2.43 ERA. In 2019, his sophomore year, he made 19 relief appearances and went 5-0 with a 2.89 ERA and 48 strikeouts over innings. After the 2019 season, Dollard played collegiate summer baseball in the Cape Cod Baseball League for the Yarmouth-Dennis Red Sox. He made four starts in 2020 before the season was cancelled due to the COVID-19 pandemic. Dollard was selected by the Seattle Mariners in the fifth round of the shortened 2020 Major League Baseball draft with the 137th overall selection. He signed for $406,000.

Dollard made his professional debut in 2021 with the Modesto Nuts and was promoted to the Everett AquaSox in June. Over 19 games (18 starts) between the two teams, he went 9–4 with a 5.14 ERA and 133 strikeouts over 105 innings. He pitched for the Arkansas Travelers in 2022. Over 27 starts, he went 16–2 with a 2.25 ERA and 131 strikeouts over 144 innings. He led the minor leagues in wins. He was also awarded the Texas League Pitcher of the Year Award.

Dollard was assigned to the Tacoma Rainiers to begin the 2023 season. Dollard made only three starts for Tacoma, logging a 7.56 ERA across innings, before he was placed on the injured list with a shoulder impingement on April 26. On June 27, it was announced that Dollard would undergo labrum surgery and miss the remainder of the season. He did not pitch in 2024. In 2025, Dollard pitched with the Arizona Complex League Mariners and Everett, going 3-4 with a 4.54 ERA over innings. He played the 2026 season with Everett and went 5–9 with a 5.59 ERA and 81 strikeouts over innings.

Jonny Farmelo

Jonathan Thomas Farmelo (born September 9, 2004) is an American professional baseball outfielder in the Seattle Mariners organization.

Farmelo attended Westfield High School in Fairfax County, Virginia. In high school, he had a .385 batting average, seven home runs, and 29 RBIs in 48 career games. As a senior, Farmelo batted .478. Farmelo committed to play college baseball at the University of Virginia.

Farmelo was selected 29th overall by the Seattle Mariners in the 2023 Major League Baseball draft. He signed with the Mariners on July 17 for an over-slot bonus of $3.2 million.

Farmelo joined the Single-A Modesto Nuts for the 2023 playoffs, playing as an outfielder. He hit .200 in four games, with one triple and one home run. Farmelo returned to Modesto in 2024, but he tore his ACL in mid-June while trying to catch a pop-up, ending his season. In 46 games before the injury, he hit .264 with four home runs and 18 stolen bases. Prior to the 2025 season, Farmelo was named the 96th best prospect in baseball by MLB.com. Farmelo returned to play that May with Everett. In June, he was placed on the injured list with a stress reaction in his rib, and missed over two months before returning to play with Everett in August. Farmelo played a total of 29 games in 2025 and hit .230 with six home runs and 16 RBIs. After the season, he played in the Arizona Fall League with the Peoria Javelinas. Farmelo returned to Everett to open the 2026 season. Between Everett and Arkansas, he .batted ,251/.375/.436 with 17 home runs and 41 stolen bases in 56 attempts.

Teddy McGraw

Edward Thomas McGraw (born October 31, 2001) is an American professional baseball pitcher in the Seattle Mariners organization.

McGraw attended Oneonta High School in Oneonta, New York and played college baseball at Wake Forest University. In 2021 and 2022, he played collegiate summer baseball with the Brewster Whitecaps of the Cape Cod Baseball League. He underwent Tommy John surgery prior to his junior year in 2023 and missed the season. Despite the injury he was selected by the Seattle Mariners in the third round of the 2023 Major League Baseball draft.https://www.thedailystar.com/sports/local_sports/mcgraw-rides-roller-coaster-year-all-the-way-to-seattle/article_cfbfa672-2772-11ee-93d0-ff9f1f75c82c.html

McGraw made his professional debut in 2024 with the Modesto Nuts, but pitched in only four games due to another arm injury. He again missed the start of the 2025 season, and returned to pitch for the Arizona Complex League Mariners and Everett AquaSox.https://www.heraldnet.com/2025/06/15/teddy-mcgraw-overcomes-long-road-in-near-perfect-aquasox-debut/ McGraw was converted into a relief pitcher prior to the 2026 season.

Michael Morales

Michael Paul Morales (born August 13, 2002) is an American professional baseball pitcher in the Seattle Mariners organization.

Morales attended East Pennsboro High School in East Pennsboro Township, Pennsylvania. He was selected by the Seattle Mariners in the third round of the 2021 Major League Baseball draft. He signed with the Mariners with an overslot $1.5 million signing bonus.

Morales made his professional debut in 2021 with the Arizona Complex League Mariners. He pitched for the Modesto Nuts in 2022 and 2023. In 2022, he led the Nuts with 125 strikeouts in innings, but had a 5–7 record and 5.91 ERA. He started 2024 with the Everett Aquasox before being promoted to the Arkansas Travelers at the beginning of July.https://x.com/milb_central/status/1807580535604297969 Despite the higher competition, he had his best season in the minors, with a 13–2 record and 3.26 ERA in 149 innings.

In 2025 with Arkansas he was 4-7 with a 4.60 ERA in 22 starts. In 2026 with Arkansas he was 2-4 with a 6.11 ERA in 17 starts.

Robinson Ortiz

Robinson Stiward Ortiz (born January 4, 2000) is a Dominican professional baseball pitcher for the Seattle Mariners of Major League Baseball (MLB). He is currently a phantom ballplayer, having spent two days on Seattle's active roster without making an appearance.

Ortiz was signed by the Los Angeles Dodgers as an international free agent on June 2, 2017. He was subsequently assigned to their Dominican Summer League affiliate. Ortiz was promoted to the Arizona League Dodgers in 2018 and the Great Lakes Loons in 2019. After not playing in 2020 due to the cancellation of the minor league season as a result of the COVID-19 pandemic, he returned to Great Lakes in 2021. He missed all of the 2022 and 2023 seasons due to injury and returned for only six games in 2024 for the Low-A Rancho Cucamonga Quakes. He began 2025 with Great Lakes but was promoted during the season, first to the Double–A Tulsa Drillers on June 17 and then to the Triple–A Oklahoma City Comets on August 12. Between the three levels, he was 5–2 with a 2.73 ERA in 48 games.

The Dodgers selected Ortiz's contract to their 40-man roster on November 6, 2025, in order to prevent him from reaching minor league free agency. On November 16, the Dodgers traded Ortiz to the Seattle Mariners in exchange for pitcher Tyler Gough.

Ortiz was optioned to the Triple-A Tacoma Rainiers to begin the 2026 season. In 15 appearances for Tacoma at the beginning of the season, he recorded a 1.69 ERA with 18 strikeouts over 16 innings of work. On May 18, 2026, Ortiz was promoted to the major leagues for the first time. He went unused out of the bullpen and was optioned back to Tacoma on May 20, becoming a phantom ballplayer. He ended the 2026 season with Tacoma with a record of 1-3 and a 5.69 ERA as he struggled with control, walking 31 batters in 49 innings.

Mason Peters

Mason Ward Peters (born December 18, 2003) is an American professional baseball pitcher in the Seattle Mariners organization.