Ben Williamson Bio
Benjamin Andrew Williamson (born November 5, 2000) is an American professional baseball third baseman for the Seattle Mariners of Major League Baseball (MLB). Known for his steady glove and contact-oriented bat, Williamson rose through the Mariners’ minor league system after a decorated college career at the College of William & Mary. He made his major league debut in 2025 and quickly established himself as a reliable defensive presence at the hot corner.
Early Life and Background
Benjamin Andrew Williamson was born on November 5, 2000, and grew up in Chantilly, Virginia. He attended Freedom High School in South Riding, Virginia, where he developed into a polished infield prospect. During his senior season in 2019, Williamson earned both conference and regional player of the year honors, signaling his readiness for the next level.
Athletics ran in his family. Williamson’s mother was a college gymnast at James Madison University, an upbringing that helped shape his balance, coordination, and discipline as a young athlete. Those traits translated to the baseball diamond, where his footwork and defensive instincts became early calling cards.
Path to Professional Baseball
After high school, Williamson enrolled at the College of William & Mary, where he played college baseball for the William & Mary Tribe. He quickly became a cornerstone of the program, earning First Team All-Colonial Athletic Association (CAA) honors three consecutive years from 2021 through 2023. He was the first player in school history to achieve that streak, underscoring his consistency and value to the Tribe.
In 2022, Williamson’s glove work earned him CAA Defensive Player of the Year after posting a .975 fielding percentage. The following season, he elevated his offensive game, batting .391 with a .513 on-base percentage, 12 home runs, 49 runs batted in, and 14 stolen bases, and was named CAA Player of the Year. That summer, he joined the Hyannis Harbor Hawks of the Cape Cod Baseball League, playing nine games of collegiate summer baseball to further sharpen his skills ahead of the draft.
Ben Williamson Career
Early Career (2023)
The Seattle Mariners selected Williamson in the second round with the 57th overall pick of the 2023 Major League Baseball draft. On July 14, 2023, he signed with the club for an under-slot deal worth $600,000. He began his professional career that year, appearing in two games for the Arizona Complex League Mariners before logging 10 games with the Class-A Modesto Nuts.
Though his initial sample was small, Williamson showed the same plate discipline that defined his college career, drawing praise from the Mariners’ player development staff for his approach and defensive reliability.
Minor League Progression (2024)
Williamson opened 2024 with the High-A Everett AquaSox and batted .315 across 29 games, earning a promotion in May to the Double-A Arkansas Travelers. With Arkansas, he hit .273 and added three home runs in 95 games. He experienced some difficulty adjusting to more advanced Double-A pitching but remained a standout defender, reinforcing the reputation he built in college.
Seattle Mariners and MLB Debut (2025)
Williamson began the 2025 season with the Triple-A Tacoma Rainiers, where he batted .281 and added three doubles in 14 games. On April 13, 2025, the Mariners promoted him to the major leagues for the first time. Two days later, he recorded a single in his first major league plate appearance, a quiet but confident start to his big-league career.
Williamson served as Seattle’s starting third baseman until the team re-acquired Eugenio Suárez on July 30, after which he was optioned back to Tacoma to finish the regular season. At the time of his demotion, he led American League third basemen in Defensive Runs Saved (DRS) but ranked near the bottom in on-base plus slugging. He finished his rookie MLB season batting .253/.294/.310 and ranked sixth among all MLB third basemen in DRS despite spending several months in the minors. He was later added to the Mariners’ roster for the American League Division Series, potentially to fill in for new father Josh Naylor, but did not appear in a postseason game and was removed from the roster for the American League Championship Series.
Defensive Strengths and Approach
Williamson’s calling card is his defense. His range, sure hands, and instincts at third base have consistently graded out as above average, both in college and across the minor leagues. Offensively, he profiles as a contact-driven hitter who works counts and uses the whole field, though refining his power and on-base production against upper-level pitching remains a developmental priority.
Notable Events and Milestones
Key milestones include becoming the first William & Mary player to earn three consecutive First Team All-CAA selections, winning CAA Defensive Player of the Year in 2022, and being named CAA Player of the Year in 2023. In the majors, his first MLB hit on April 15, 2025, and his early-season run as Seattle’s starting third baseman stand as the defining moments of his rookie year.
Ben Williamson Career Highlights
Across his amateur and professional career, Williamson has built a resume defined by defensive excellence and consistent contact hitting. His college awards and rapid climb through the Mariners’ system highlight a player whose glove has traveled faster than his bat, with the latter steadily catching up.
Collegiate and Minor League Highlights
At William & Mary, he earned First Team All-CAA honors in 2021, 2022, and 2023, won CAA Defensive Player of the Year in 2022, and was named CAA Player of the Year in 2023. As a professional, he debuted with the Arizona Complex League Mariners and Modesto Nuts in 2023, reached High-A Everett in 2024, advanced to Double-A Arkansas, and opened 2025 at Triple-A Tacoma before his first major league call-up. His first MLB hit came on April 15, 2025, and he finished his rookie season batting .253/.294/.310 while ranking sixth among MLB third basemen in DRS.
Other Performances
Williamson also played nine games of collegiate summer baseball with the Hyannis Harbor Hawks of the Cape Cod Baseball League prior to the 2023 MLB draft, gaining valuable exposure against top amateur talent.
Ben Williamson Family
Family Background and Athletic Lineage
Williamson grew up in Chantilly, Virginia, in a family with a strong athletic tradition. His mother was a college gymnast at James Madison University, and that background contributed to his balance, body control, and disciplined work ethic as a young athlete.
Personal Life
Public details about Williamson’s personal life beyond his family upbringing are limited. He is known to keep a low profile off the field, focusing on his development as a professional baseball player.
2025 Season Performance
Williamson’s 2025 season was a tale of two halves. He opened the year at Triple-A Tacoma and earned a quick promotion to the majors on April 13, stepping in as Seattle’s everyday third baseman. He recorded a single in his first plate appearance two days later and provided Gold Glove-caliber defense at the hot corner through the first four months of the season, ultimately leading American League third basemen in Defensive Runs Saved at the time of his July 30 demotion.
Offensively, the season was more of a grind. He finished the year batting .253/.294/.310, with an on-base plus slugging mark that ranked near the bottom among AL third basemen. His struggles against major league breaking balls were a key talking point, though the Mariners remained high on his long-term trajectory given his age, contact skills, and elite defense.
After the Mariners re-acquired Eugenio Suárez at the trade deadline, Williamson returned to Tacoma to play regularly down the stretch. He was added to the Mariners’ roster for the American League Division Series, potentially to fill in for new father Josh Naylor, though he did not appear in a postseason game and was removed from the roster for the American League Championship Series. Heading into the offseason, his outlook hinges on refining his offensive approach while maintaining the defensive standard that has defined his career to this point.