Miles Mastrobuoni Bio
Miles James Mastrobuoni, born on October 31, 1995, in Livermore, California, is an American professional baseball utility player for the Seattle Mariners of Major League Baseball (MLB). Known for his versatility across multiple positions, Mastrobuoni has built a steady professional career since being selected in the 2016 MLB draft. He has also represented Italy in international competition, reflecting his family heritage.
Before joining Seattle, Mastrobuoni played in MLB for the Tampa Bay Rays and the Chicago Cubs. His journey through the minor leagues and his ability to adapt at the major league level have defined his path as a reliable utility option. He continues to be valued for his defensive flexibility and contact-oriented approach at the plate.
Early Life and Background
Miles James Mastrobuoni was born and raised in Livermore, California, a city in the eastern San Francisco Bay Area known for its strong youth sports culture. Growing up in this environment, Mastrobuoni developed an early passion for baseball, the sport that would eventually shape his professional life.
He attended Granada High School in Livermore, where he played on the school’s baseball team and began attracting attention as a versatile athlete. After high school, Mastrobuoni continued his baseball development at the College of San Mateo, a community college in California. He played two years of college baseball for the program, gaining valuable experience and refining the skills that would prepare him for the next level of competition.
Following his time at the College of San Mateo, Mastrobuoni transferred to the University of Nevada, where he joined the Nevada Wolf Pack baseball team. During the summer of 2015, he played summer league baseball for the Rochester Honkers of the Northwoods League, further broadening his exposure to competitive baseball.
Path to Baseball
Miles James Mastrobuoni’s path to professional baseball was built step by step, beginning with his time at Granada High School and continuing through two years at the College of San Mateo. His performance at the community college level caught the attention of four-year programs, leading to his transfer to the Nevada Wolf Pack. Playing in the Northwoods League during the summer of 2015 also helped him develop against high-level amateur competition.
His combination of versatility, contact hitting, and base-running ability made him an attractive prospect heading into the 2016 MLB draft. Scouts noted his ability to play multiple positions, a trait that would become a defining characteristic of his professional career.
On June 10, 2016, the Tampa Bay Rays selected Mastrobuoni in the 14th round, with the 420th overall pick. This selection launched his professional career and set the stage for years of development within the Rays organization.
Miles Mastrobuoni Career
Early Career (2016-2019)
Miles James Mastrobuoni made his professional debut in 2016 with the Low-A Hudson Valley Renegades, where he hit .267 across 61 games. The following year, he moved up to the Single-A Bowling Green Hot Rods, playing in 104 games and batting .264 with three home runs, 39 RBI, and 18 stolen bases. His ability to contribute across multiple areas of the game was already evident.
In 2018, Mastrobuoni split time between the High-A Charlotte Stone Crabs and the Double-A Montgomery Biscuits, hitting a combined .285 in 330 at-bats. The following season, he returned primarily to Montgomery, where he posted a .299 batting average with four home runs, 34 RBI, and 15 stolen bases in 107 games. He also appeared in four games for the Triple-A Durham Bulls, giving him his first taste of the highest minor league level.
Tampa Bay Rays Era (2016-2022)
After years of steady development in the Rays system, Miles James Mastrobuoni reached the major leagues in September 2022. He was assigned to Triple-A Durham to begin the 2022 season, where he spent the majority of the year and hit .300 with career-highs in home runs, RBI, and stolen bases.
On September 22, 2022, Mastrobuoni was selected to the 40-man roster and promoted to the major leagues for the first time. The following day, he collected his first MLB hit, a single off Anthony Bass of the Toronto Blue Jays. He appeared in eight games for the Rays that season, going 3-for-16 with a stolen base. On November 15, 2022, the Rays traded him to the Chicago Cubs in exchange for pitcher Alfredo Zárraga.
Chicago Cubs Era (2023-2024)
Miles James Mastrobuoni made the Cubs’ Opening Day roster in 2023, starting in right field and batting ninth against the Milwaukee Brewers. On July 21, he hit his first career home run, off Jack Flaherty of the St. Louis Cardinals. In 60 games during his rookie season, he batted .241 with one home run, five RBI, and 13 stolen bases.
In 2024, Mastrobuoni appeared in 50 games for Chicago, batting .194 with no home runs, four RBI, and two stolen bases. On January 9, 2025, the Cubs designated him for assignment following their acquisition of Matt Festa, opening the door for his next move.
Seattle Mariners Era (2025-Present)
On January 14, 2025, Miles James Mastrobuoni was traded to the Seattle Mariners in exchange for cash considerations. He started the 2025 season as a utility player for Seattle before being sent to the Triple-A Tacoma Rainiers following the acquisition of Josh Naylor. He returned to the majors within a week when Ben Williamson was demoted, though he was later sent back to Tacoma after the Little League Classic in August.
Mastrobuoni played in the final game of the 2025 regular season, hitting a double that was the final extra-base hit allowed by Clayton Kershaw of the Los Angeles Dodgers in his regular season career. He finished the 2025 regular season batting .250 with one home run, 12 RBI, and six stolen bases in 76 games for the Mariners. The Mariners added Mastrobuoni to their roster for the American League Championship Series, replacing Luke Raley.
Driving Style and Strengths
Miles James Mastrobuoni is valued primarily for his defensive versatility, as he is capable of playing multiple positions across the diamond. His contact-oriented approach at the plate, combined with strong base-running instincts, makes him a useful utility option. Throughout his career, he has demonstrated the ability to adapt to different roles and contribute in a variety of situations.
Notable Events and Milestones
One of the most memorable moments of Miles James Mastrobuoni’s career came at the end of the 2025 regular season, when his double marked the final extra-base hit allowed by Clayton Kershaw in Kershaw’s regular-season career. His first MLB hit, a single off Anthony Bass in 2022, and his first career home run, off Jack Flaherty in 2023, are also notable milestones. Additionally, his selection to the Mariners’ American League Championship Series roster in 2025 highlighted his value to the organization.
Miles Mastrobuoni Career Wins
Miles James Mastrobuoni’s career has been defined by consistency and adaptability rather than by a long list of individual awards. As a utility player, his value is reflected in his ability to contribute across multiple positions and in various roles throughout a season.
Minor League Highlights
During his time in the minor leagues, Miles James Mastrobuoni posted strong numbers across multiple levels. In 2022, he hit .300 at Triple-A Durham with career-highs in home runs and stolen bases. His .296 batting average in 2021 and his .299 mark in 2019 demonstrated his consistent contact ability throughout the Rays system.
Other Performances
Miles James Mastrobuoni also represented Italy in the 2023 World Baseball Classic, where he played in five games and batted 5-for-18 with two doubles, two RBI, and a stolen base. His participation in the international tournament added another notable chapter to his professional resume.
Miles Mastrobuoni Family
Family Background and Racing Lineage
Public information about Miles James Mastrobuoni’s family background is limited. He grew up in Livermore, California, where he developed his early passion for baseball. His Italian heritage, as evidenced by his participation in the 2023 World Baseball Classic representing Italy, reflects a meaningful family connection to his ancestral roots.
Personal Life
Details about Miles James Mastrobuoni’s personal life, including his marital status and family, are not widely available in public sources. He has maintained a relatively private personal life while continuing his professional baseball career in Major League Baseball.
2025 Season Performance
Miles James Mastrobuoni’s 2025 season with the Seattle Mariners reflected his role as a versatile utility player. He appeared in 76 games for Seattle, batting .250 with one home run, 12 RBI, and six stolen bases. His season included stints with both the Mariners and the Triple-A Tacoma Rainiers, as roster moves required him to move between levels multiple times.
A highlight of his 2025 campaign came in the final game of the regular season, when his double off Clayton Kershaw marked the final extra-base hit Kershaw allowed in his regular-season career. Mastrobuoni was also added to the Mariners’ roster for the American League Championship Series, replacing Luke Raley, demonstrating the organization’s confidence in his abilities during the postseason.
