Janson Junk Bio
Janson Randall Junk is an American professional baseball pitcher for the Miami Marlins of Major League Baseball (MLB). He has previously played in MLB for the Los Angeles Angels, Milwaukee Brewers, and Oakland Athletics, and spent time in the Houston Astros organization after being claimed off waivers. A former walk-on at Seattle University, Junk has built a career as a durable starting pitcher who has worked his way through four major-league organizations since debuting in 2021.
Standing 6 feet 1 inch tall and throwing from the right side, Junk has continued to develop his game at the highest level. In 2025, he earned a regular role in the Miami rotation, and the Marlins announced him as their fifth starter entering the 2026 season, signaling the organization’s long-term confidence in his arm.
Early Life and Background
Janson Randall Junk was born on January 15, 1996, in Federal Way, Washington. He grew up in the Pacific Northwest and attended Decatur High School in Federal Way, where he developed as a young pitcher. Federal Way, located just south of Seattle, has produced a number of athletes, and Junk credits the area’s strong baseball culture for sparking his interest in the sport.
As a high-schooler, Junk showed enough promise on the mound to attract college attention, though he was not heavily recruited by major Division I programs. That reality shaped his path to the next level, as he chose to attend Seattle University in nearby Seattle, Washington, and try to prove himself at the collegiate level.
Path to Baseball
Junk played college baseball at Seattle University, where he spent three seasons (2015–2017) with the Redhawks. He joined the program as a walk-on, meaning he earned his roster spot without an athletic scholarship, a fact that underscored how far he had to climb to reach the professional ranks. During the summer of 2015, Junk played collegiate summer baseball with the Bend Elks of the West Coast League, gaining valuable innings against wood-bat competition.
After his third season with the Redhawks, Junk declared for the 2017 Major League Baseball draft. The New York Yankees selected him in the 22nd round, with the 662nd overall pick, making him one of the rare walk-ons to reach a Major League organization. His path from undrafted walk-on to professional pitcher began in the Yankees’ farm system that summer.
Janson Junk Career
Early Career (2017–2020)
Junk’s professional career began in the Yankees’ minor-league system. He spent the 2018 season with the Single-A Charleston RiverDogs, where he posted a 7–5 win-loss record with a 3.77 earned run average (ERA) across 17 appearances, establishing himself as a reliable innings-eater in the low minors.
In 2019, Junk moved up to the High-A Tampa Tarpons of the Florida State League for most of the year, while also making one start each for the Double-A Trenton Thunder and the Triple-A Scranton/Wilkes-Barre RailRiders. The COVID-19 pandemic wiped out the 2020 minor-league season, denying Junk a full year of development. He began the 2021 season with the Yankees’ new Double-A affiliate, the Somerset Patriots, where he pitched well enough to be included in a midseason trade.
Los Angeles Angels Breakthrough (2021–2022)
On July 30, 2021, the Yankees traded Junk and Elvis Peguero to the Los Angeles Angels in exchange for starting pitcher Andrew Heaney. The deal gave Junk a clearer path to the Majors, and on September 3, 2021, the Angels selected his contract from the Double-A Rocket City Trash Pandas, adding him to their major-league roster. He made his MLB debut two days later, starting against the Texas Rangers and taking the loss after allowing five runs (four earned) on six hits in 3⅔ innings, with two strikeouts and one walk.
In his first full big-league stint, Junk continued to grind through the Angels’ system. On July 27, 2022, he earned his first career victory after tossing five scoreless innings against the Kansas City Royals, a milestone that signaled his readiness to stick in the Majors. The Angels eventually traded him that offseason as they retooled their pitching staff.
Milwaukee Brewers Era (2022–2024)
On November 22, 2022, the Angels traded Junk, Elvis Peguero, and Adam Seminaris to the Milwaukee Brewers for outfielder Hunter Renfroe. Junk was optioned to the Triple-A Nashville Sounds to begin the 2023 season, and he made only two appearances for the Brewers during the year, allowing five runs (four earned) on eight hits with five strikeouts across 7⅓ innings pitched.
Junk was again optioned to Triple-A Nashville to begin the 2024 season. In five appearances for Milwaukee, he posted a 6.75 ERA with eight strikeouts across eight innings pitched. The Brewers designated him for assignment on July 28, 2024, ending his time in the organization.
Houston Astros and Oakland Athletics (2024)
On August 2, 2024, Junk was claimed off waivers by the Houston Astros. In four starts for the Triple-A Sugar Land Space Cowboys, he struggled to a 6.14 ERA with 10 strikeouts over 14⅔ innings pitched. On August 29, the Astros designated him for assignment, cutting ties just under a month later.
Two days later, on August 31, 2024, the Oakland Athletics claimed Junk off waivers. He made one appearance for Oakland, allowing six hits and two walks without recording an out against the Seattle Mariners. Oakland designated him for assignment on September 5, and after clearing waivers he was sent outright to the Triple-A Las Vegas Aviators on September 7. Junk elected free agency on November 4, 2024.
Miami Marlins Era (2025–Present)
On February 10, 2025, Junk signed a minor-league contract with the Miami Marlins that included an invitation to spring training. He opened the year with the Triple-A Jacksonville Jumbo Shrimp, logging a 4–3 record and 2.78 ERA with 40 strikeouts across 45⅓ innings in nine appearances (eight starts). On May 24, the Marlins selected his contract, adding him to the active roster, and he made 21 appearances (16 starts) for Miami, compiling a 6–4 record and 4.17 ERA with 77 strikeouts and one save over 110 innings of work.
On March 20, 2026, the Marlins announced Junk as their fifth starter entering the 2026 season, beating out Braxton Garrett for the role. Through May 25, 2026, he has posted a 10–12 record with a 4.84 ERA and 154 strikeouts, cementing his place in Miami’s rotation. The Marlins have built a major role around the former walk-on, a remarkable rise for a 22nd-round pick.
Driving Style and Strengths
Junk works as a starting pitcher who relies on command, durability, and a deep pitch count. He is comfortable going multiple innings and has shown the ability to limit damage when working ahead in counts. His strikeout totals in Miami (77 in 110 innings in 2025, then 154 in his first stretch of 2026) suggest an evolving swing-and-miss element to complement his contact management, and his low walk rates give the Marlins’ defense a chance to play behind him.
Notable Events and Milestones
Junk’s MLB debut on September 5, 2021, against the Texas Rangers stands as his first major milestone, followed by his first career win on July 27, 2022, against the Kansas City Royals after five scoreless innings. His 2025 selection to Miami’s roster and the March 2026 announcement as the Marlins’ fifth starter are the signature moments of his professional career so far, with the latter marking the first time an organization has handed him an opening-day rotation job.
Janson Junk Career Wins
Junk has built his win totals gradually across multiple organizations, with his clearest breakthroughs coming in 2022 and again with the Marlins in 2025 and 2026. Through May 25, 2026, he has posted a 10–12 record with a 4.84 ERA and 154 strikeouts in Major League Baseball.
MLB Highlights
Junk’s first MLB win came on July 27, 2022, when he tossed five scoreless innings against the Kansas City Royals. His most recent stretch of regular work came in 2026, when the Marlins named him their fifth starter and he produced 154 strikeouts through late May. He also added a save in 2025 while working out of the Miami bullpen and rotation, showing his versatility.
Other Wins and Performances
In the minors, Junk went 7–5 with a 3.77 ERA at Single-A Charleston in 2018 and posted a 4–3 record with a 2.78 ERA at Triple-A Jacksonville in 2025, numbers that helped earn him his latest call-up to the Majors.
Janson Junk Family
Family Background and Racing Lineage
Junk grew up in Federal Way, Washington, and attended Decatur High School before enrolling at Seattle University. Public information about his parents and immediate family is limited, and detailed records of a multi-generational baseball lineage have not been widely published.
Personal Life
Junk’s personal life is largely kept private, and details about a spouse, partner, or children are not publicly confirmed. He has spent most of his professional life between the Pacific Northwest and the various clubhouses that have employed him in the American and National Leagues.
2025 Season Performance
Junk’s 2025 season began as a non-roster invitee with the Marlins, and he turned the opportunity into a midseason promotion. At Triple-A Jacksonville, he went 4–3 with a 2.78 ERA and 40 strikeouts in 45⅓ innings, earning a May 24 call-up to the active roster. From there, he delivered 21 appearances (16 starts) for Miami, finishing 6–4 with a 4.17 ERA, 77 strikeouts, and one save over 110 innings, a workload that convinced the organization he belonged in the rotation.
The Marlins’ announcement on March 20, 2026, naming Junk as their fifth starter for the 2026 season was the clearest sign yet of his standing in Miami. Through May 25, 2026, he had logged a 10–12 record with a 4.84 ERA and 154 strikeouts, showing continued growth as a workhorse arm. With a multi-year contract reportedly running through 2025 and beyond, Junk enters the rest of the 2026 season as a foundational piece of the Marlins’ pitching staff and a candidate to anchor a young rotation for seasons to come.
