Seattle Mariners minor league players

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

Players

Michael Arroyo

Michael Arroyo (born November 3, 2004) is a Colombian professional baseball second baseman and shortstop in the Seattle Mariners organization.

Arroyo signed with the Seattle Mariners as an international free agent in January 2022 for $1.375 million, the most for a Colombian that year. He was one of three Mariners international prospects who received signing bonuses of more than $1 million in 2022, along with Lázaro Montes and Martín Gonzalez.

Arroyo made his professional debut that year with the Dominican Summer League Mariners. Arroyo started 2023 with the Arizona Complex League Mariners before being promoted to the Single-A Modesto Nuts in mid-June. He started 2024 with Modesto for being promoted to the Everett AquaSox in late June. In 120 games for the two teams, he hit .285/.400/.409 with 23 home runs and 89 runs batted in. He was also hit by 23 pitches, seventh-most in the minors in 2024. He was named the 98th best prospect in baseball by MLB.com before the 2025 season.

Arroyo played for the Colombian national team in 2026 World Baseball Classic qualifiers, held in March 2025 in Tucson, Arizona. He hit a two-run double in Colombia's 8–1 win over China on March 3. Arroyo had three hits in 10 at-bats with two RBI as Colombia advanced the WBC, going undefeated in qualifiers. Arroyo began the 2025 season with High-A Everett AquaSox.

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Charlie Beilenson

Charles Graeme Beilenson (born December 10, 1999) is an American professional baseball pitcher in the Seattle Mariners organization.

Beilenson attended Chaminade College Preparatory School in West Hills, California and played college baseball at Brown University for two years and Duke University for two years. He was a consensus All-American his senior year at Duke in 2024.

Beilenson was selected by the Seattle Mariners in the fifth round of the 2024 Major League Baseball draft. He made his professional debut that year with the Modesto Nuts. He pitched 2025 with the Everett AquaSox and Arkansas Travelers and started 2026 with Arkansas.

Beilenson played for the Israel national baseball team at the 2026 World Baseball Classic.

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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.

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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, starting 25 games and going 4-5 with a 4.17 ERA and 124 strikeouts over 116+2⁄3 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 and 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.

On April 24, 2026, the Rays traded Cummings back to the Mariners in exchange for Casey Legumina.

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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, and as a senior in 2017, he went 2-0 with a 1.43 ERA and 42 strikeouts over 29+1⁄3 innings. 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 43+2⁄3 innings. After the 2019 season, Dollard played collegiate summer baseball in the Cape Cod Baseball League with 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.

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 8+1⁄3 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 69+1⁄3 innings.

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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.

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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.

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. McGraw was converted into a relief pitcher prior to the 2026 season.

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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 120+1⁄3 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. Despite the higher competition, he had his best season in the minors, with a 13–2 record and 3.26 ERA in 149 innings.

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Robinson Ortiz

Robinson Stiward Ortiz is a Dominican professional baseball pitcher for the Seattle Mariners of Major League Baseball (MLB).

Ortiz was signed by the Los Angeles Dodgers as an international free agent on June 2, 2017 and assigned to their Dominican Summer League affiliate. He 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, 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.

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Mason Peters

Mason Ward Peters is an American professional baseball pitcher in the Seattle Mariners organization.

Peters attended Live Oak Classical School in his hometown of Waco, Texas and played college baseball at Temple College and later transferred to Dallas Baptist University.

Peters was selected by the Seattle Mariners in the fourth round of the 2025 Major League Baseball draft and later signed for $550,000. Peters made his professional debut in 2026 with the Inland Empire 66ers. In just 10 starts, Peters has recorded a 1.59 ERA with 57 strikeouts over 39.2 innings of work.

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Kaden Polcovich

Kaden James Polcovich (born February 21, 1999) is an American professional baseball second baseman in the Seattle Mariners organization.

Polcovich attended Deer Creek High School in Edmond, Oklahoma. After his junior year 2016, in which he batted .321 with 26 RBIs, he committed to play college baseball at the University of Kentucky. Polcovich was not selected in the 2017 Major League Baseball draft and enrolled at Kentucky.

Polcovich was dismissed from the Kentucky baseball team during the first semester of his freshman year after skipping many classes. He did not play for the Wildcats in a game. He left Kentucky and enrolled at Northwest Florida State College, where he hit .280 with three home runs, 18 RBIs, and 13 stolen bases over 40 games as a freshman in 2018, then batting .273 with 12 home runs and 38 RBIs over 53 games as a sophomore in 2019. After his sophomore year, he played collegiate summer baseball with the Chatham Anglers of the Cape Cod Baseball League and was named a league all-star. He also transferred to Oklahoma State University. As a junior at Oklahoma State in 2020, he batted .344 with two home runs in 21 games before the season was cancelled due to the COVID-19 pandemic. He was selected by the Seattle Mariners in the third round, with the 78th overall pick, of the 2020 Major League Baseball draft. He signed for $575,000.

Polcovich made his professional debut in 2021 with the Everett AquaSox of the High-A West with whom he batted .271/.415/.505 with ten home runs, 47 RBIs, and 16 stolen bases over 58 games. He was promoted to the Arkansas Travelers of the Double-A South in late July, slashing .133/.242/.211 with two home runs, 14 RBIs, and four doubles over 36 games to end the season. He returned to Arkansas for the 2022 season. Over 118 games, he batted .242/.345/.386 with 12 home runs, 60 RBIs, and 18 stolen bases. He repeated in Double-A in 2023 and 2024, not raising his batting average or on-base plus slugging above his 2022 numbers. He did not play in the minors in 2025.

Polcovich's father, Kevin Polcovich played in Major League Baseball for the Pittsburgh Pirates in 1997 and 1998.

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Nick Raposo

Nicholas Louis Raposo (born June 3, 1998) is an American professional baseball catcher in the Seattle Mariners organization. He is currently a phantom ballplayer, having spent two days on the St. Louis Cardinals' active roster without making an appearance.

On June 15, 2020, Raposo signed a minor league contract with the St. Louis Cardinals after he was not selected in the shortened 2020 Major League Baseball draft.

Raposo made his professional debut in 2021 with the Double-A Springfield Cardinals, hitting .267/.368/.362 with one home run and 12 RBI across 42 games. He returned to Springfield the following season, playing in 59 games and batting .270/.345/.461 with seven home runs and 34 RBI. Raposo split the 2023 campaign between Springfield and the Triple-A Memphis Redbirds. In 40 games between the two teans, he accumulated a .241/.321/.386 batting line with four home runs and 13 RBI. Raposo began the 2024 season with Memphis, hitting .187/.241/.323 with five home runs and 22 RBI in 47 games prior to his call–up.

On June 22, 2024, Raposo was selected to the 40-man roster and promoted to the major leagues for the first time following an injury to Iván Herrera. He did not make an appearance for St. Louis and was optioned down to Memphis on June 24. Raposo was designated for assignment by the Cardinals on July 29.

On August 1, 2024, Raposo was claimed off waivers by the Toronto Blue Jays. In 20 games for the Triple-A Buffalo Bisons, he slashed .246/.361/.312 with one home run and five RBI. Raposo was designated for assignment following the signing of Yimi García on December 13.

On December 19, 2024, Raposo was claimed off waivers by the Seattle Mariners. On January 14, 2025, Raposo was designated for assignment by the Mariners. He cleared waivers and was sent outright to the Triple-A Tacoma Rainiers on January 17.

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Brock Rodden

Brock Rodden (born May 25, 2000) is an American professional baseball infielder in the Seattle Mariners organization.

Rodden attended Oktaha High School in Oktaha, Oklahoma and played college baseball at Seminole State College and Wichita State University. As a sophomore at Wichita State in 2022, he batted .338 with 17 home runs and 48 RBI. Rodden was drafted in the 10th round of the 2022 Major League Baseball draft by the Oakland Athletics but opted not to sign with the team. Returning as a junior at Wichita State in 2023, he played in 55 games and slashed .371/.474/.677 with 17 home runs and 64 RBI and was named the American Athletic Conference Player of the Year. In 2022, he played collegiate summer baseball with the Orleans Firebirds of the Cape Cod Baseball League, and returned to the league in 2023 with the Cotuit Kettleers. Rodden was selected by the Seattle Mariners in the 5th round of the 2023 Major League Baseball draft. He signed with the team for $200,000.

Rodden made his professional debut with the Arizona Complex League Mariners and Modesto Nuts, batting .311 with two home runs over 34 games between both teams in 2023. He split the 2024 season between the High-A Everett AquaSox and Double-A Arkansas Travelers, hitting .257 with 14 home runs, 64 RBI, and 29 stolen bases over 131 games. Rodden was assigned to Arkansas to begin the 2025 season.

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Houston Roth

Houston T. Roth (born March 9, 1998) is an American professional baseball pitcher in the Seattle Mariners of Major League Baseball organization. Roth is currently a phantom ballplayer, having spent 6 days with the Baltimore Orioles without an appearance.

Roth attended Oxford High School and played college baseball at the University of Mississippi. In 2018, he played collegiate summer baseball with the Hyannis Harbor Hawks of the Cape Cod Baseball League. In his junior year at Ole Miss, Roth made four starts with a 1-1 record along with a 3.67 ERA and 47 strikeouts.

Roth was selected in the 29th round of the 2019 Major League Baseball draft by the Baltimore Orioles. Roth made his professional debut with the Delmarva Shorebirds in 2021 posting an 8-4 record with an 4.54 ERA. He posted similar stats with the Aberdeen IronBirds in 2022 with a 10-5 record, 4.49 ERA, and 108 strikeouts in 100 innings.

On July 29, 2025, the Orioles selected Roth to the major leagues first time in his career. However he would not yet make his MLB debut, and on August 11, the Orioles outrighted him from the 40-man roster.

On February 18, 2026, Roth signed a minor-league deal with the Seattle Mariners.

Roth grew up as a fan of the Houston Astros.

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Jackson Steensma

Jackson Joseph Steensma (born March 12, 2004) is an American professional baseball pitcher in the Seattle Mariners organization.

Steensma attended Byron Center High School in Byron Center, Michigan and played college baseball at Appalachian State University. He missed the 2025 season after undergoing Tommy John Surgery. Despite the injury, he was selected by the Seattle Mariners in the ninth round of the 2025 Major League Baseball draft.

Steensma made his professional debut in 2026 with the Inland Empire 66ers.

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Jared Sundstrom

Jared Sundstrom (born June 21, 2001) is an American professional baseball outfielder in the Seattle Mariners organization.

Sundstrom attended Point Arena High School in Point Arena, California and played college baseball at Santa Rosa Junior College and UC Santa Barbara. As a junior at UC Santa Barbara in 2023, he played in fifty games and batted .322 with 15 home runs and 43 RBIs and was named to the All-Big West Conference First Team. After the season, he was selected by the Seattle Mariners in the tenth round of the 2023 Major League Baseball draft. Sundstrom signed with the team for $165,500.

Sundstrom made his professional debut after signing with the Arizona Complex League Mariners and also played with the Modesto Nuts, batting .240 with three home runs over 22 games between both teams. He played the 2024 season with the Everett AquaSox and hit .263 with 13 home runs, 63 RBIs, and 26 stolen bases over 114 games. Following the season's end, he was selected to play in the Arizona Fall League with the Peoria Javelinas. Sundstrom was assigned to the Arkansas Travelers for the 2025 season. Over 115 games, he batted .219 with 12 home runs, 53 RBIs, and 35 stolen bases.

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