Sean Hjelle

Sean Anthony Hjelle Bio

Sean Anthony Hjelle is an American professional baseball pitcher who currently plays for the Orix Buffaloes of Nippon Professional Baseball. Listed at 6 feet 11 inches tall, Hjelle is tied with former pitcher Jon Rauch as the tallest player in Major League Baseball history. He played college baseball for the University of Kentucky before the San Francisco Giants selected him in the second round of the 2018 MLB Draft. Hjelle made his MLB debut with the Giants in May 2022 and spent parts of four seasons with the organization before joining the Orix Buffaloes in January 2026.

Early Life and Background

Sean Hjelle was born on May 7, 1997. He attended Mahtomedi High School in Mahtomedi, Minnesota, where he excelled in both baseball and basketball. As a high school pitcher, Hjelle threw a two-seam fastball, four-seam fastball, changeup, and cutter. Despite his impressive repertoire, Hjelle was not drafted out of high school and chose to continue his baseball career at the collegiate level.

Hjelle enrolled at the University of Kentucky, where he played for the Kentucky Wildcats baseball program. His time in college proved transformative for his development as a pitcher and positioned him for professional baseball.

Path to Professional Baseball

During his sophomore season at Kentucky in 2017, Hjelle emerged as one of the top pitchers in college baseball. He was named the Southeastern Conference Pitcher of the Year after posting a 9-2 record with a 3.17 earned run average during the regular season. His dominance was particularly evident in conference play, where he went 7-1 with a remarkable 1.90 ERA in SEC games. This breakout campaign established Hjelle as a highly regarded pitching prospect heading into his junior year.

As a junior in 2018, Hjelle appeared in 15 games, making 14 starts. He compiled a 7-5 record with a 3.44 ERA, demonstrating continued development and consistency on the mound. His strong collegiate performance caught the attention of MLB scouts and set the stage for his professional career.

Sean Anthony Hjelle Career

Minor League Development (2018-2021)

The San Francisco Giants selected Hjelle in the second round of the 2018 MLB Draft, using the 45th overall pick. He signed for a $1.5 million signing bonus and began his professional career with the Salem-Keizer Volcanoes of the Short-Season A Northwest League. Hjelle spent the entire 2018 season with Salem-Keizer, making 12 starts and posting a 5.06 ERA.

In 2019, Hjelle began the season with the Augusta GreenJackets of the Single-A South Atlantic League, serving as their Opening Day starter. He received a promotion to the High-A San Jose Giants in May and continued his ascent through the minors. In August, the Giants promoted Hjelle to the Double-A Richmond Flying Squirrels, where he finished the season. Across 28 starts between all three affiliates, he went 7-9 with a 3.32 ERA, showcasing his ability to handle advanced competition.

The 2020 season was lost due to the COVID-19 pandemic, which canceled the minor league campaign. Hjelle returned in 2021 with the Sacramento River Cats of the Triple-A Pacific Coast League. Following the season, the Giants added him to their 40-man roster, protecting him from the Rule 5 Draft and signaling their intention to give him an opportunity at the major league level.

San Francisco Giants Breakthrough (2022-2025)

Hjelle began the 2022 season with Sacramento before receiving his first major league call-up. He made his MLB debut on May 6, 2022. Later that season on September 28, Hjelle earned his first career win by pitching four innings of one-run ball against the Colorado Rockies in a 6-3 Giants victory. With Sacramento that year, he went 6-8 with a 4.92 ERA in 22 starts covering 97 innings. In his limited action with San Francisco, he posted a 1-2 record with a 5.76 ERA and 28 strikeouts across 25 innings of relief work.

The Giants optioned Hjelle to Sacramento for the start of the 2023 season. He appeared in 15 games out of the bullpen for San Francisco, recording a 2-1 record with a 6.52 ERA and 31 strikeouts over 29 innings. His versatility as both a starter and reliever became a valuable asset for the organization.

In 2024, Hjelle established himself as a reliable member of the Giants bullpen. He made 58 appearances, compiling a 3-4 record with a 3.90 ERA and 75 strikeouts across 80 and two-thirds innings. His durability and consistency throughout the season demonstrated his ability to handle high-volume relief work at the major league level.

Transition Period (2025)

Hjelle opened the 2025 season with Sacramento at the Triple-A level before receiving another major league opportunity. In 12 appearances with the Giants, he struggled to find his rhythm, posting a 1-1 record with a 7.80 ERA and 11 strikeouts over 15 innings. On July 30, 2025, the Giants designated Hjelle for assignment. He cleared waivers and was sent outright to Triple-A Sacramento on August 3. Following the season, Hjelle elected free agency on November 6, 2025, ending his tenure with the San Francisco organization.

Orix Buffaloes Era (2026-Present)

On January 11, 2026, Hjelle signed with the Orix Buffaloes of Nippon Professional Baseball. The move represented a new chapter in his career as he joined one of Japan’s premier baseball leagues. Through mid-May 2026, Hjelle appeared in multiple games for the Buffaloes, posting a 1-2 record with an impressive 1.85 ERA and 24 strikeouts, demonstrating strong early success in his transition to NPB.

Driving Style and Strengths

Hjelle’s most distinctive physical attribute is his exceptional height at 6 feet 11 inches, which gives him a unique leverage advantage on the mound. His delivery generates considerable downward plane on his pitches, making it difficult for hitters to elevate the ball. Throughout his career, he has shown the ability to work as both a starting pitcher and reliever, displaying adaptability and pitchability at various competition levels.

Notable Events and Milestones

Hjelle’s first career MLB win on September 28, 2022, against the Colorado Rockies marked a significant milestone in his professional journey. His tie with Jon Rauch as the tallest players in MLB history has made him a notable figure in baseball trivia and media coverage. His transition to NPB with the Orix Buffaloes represents a meaningful career development, as he continues his professional baseball career in Japan.

Sean Anthony Hjelle Career Wins

Across his professional career spanning minor league baseball, Major League Baseball, and Nippon Professional Baseball, Hjelle has accumulated wins at each level. His MLB career includes both starting and relief appearances, while his NPB tenure shows promising early results.

Major League Baseball Highlights

During his time with the San Francisco Giants from 2022 to 2025, Hjelle appeared in 85 total games. He compiled a 7-8 win-loss record with a 5.11 earned run average and 145 strikeouts across his MLB career. His 2024 season represented his most productive year at the major league level, as he served as a key bullpen piece for the Giants and logged 58 appearances with a 3.90 ERA.

Nippon Professional Baseball Highlights

Through early May 2026, Hjelle has posted a 1-2 record with an impressive 1.85 ERA and 24 strikeouts in his NPB career with the Orix Buffaloes. While the sample size remains small, his early numbers suggest a successful transition to Japanese baseball.

Sean Anthony Hjelle Family

Family Background and Racing Lineage

Limited information is publicly available regarding Hjelle’s family background and racing lineage, as these details are not extensively documented in verified sources.

Personal Life

Hjelle was previously married to Caroline. The couple has two children together. Hjelle and Caroline have since divorced. Throughout his professional career, Hjelle has maintained connections to his Minnesota roots while pursuing his baseball career across multiple organizations and countries.

2025 Season Performance

The 2025 season represented a challenging year for Hjelle with the San Francisco Giants organization. After beginning the year at Triple-A Sacramento, he received a mid-season call-up but struggled to find consistency at the major league level. His 7.80 ERA across 15 innings of work reflected the difficulties he faced during this period. The Giants’ decision to designate him for assignment in late July followed by his outright assignment to Sacramento marked a turning point in his tenure with the organization.

Despite the struggles at the MLB level, Hjelle continued to work and pitch in the minor leagues throughout the remainder of the 2025 season. His election of free agency in November opened new opportunities, ultimately leading to his signing with the Orix Buffaloes in January 2026. The move to NPB offered Hjelle a fresh start and new environment to continue his professional baseball career following his departure from the Giants system.