James Griffin Jax Biography
James Griffin Jax (born November 22, 1994) is an American professional baseball pitcher for the Tampa Bay Rays of Major League Baseball (MLB). He has previously played in MLB for the Minnesota Twins. Jax is also an officer in the United States Air Force Reserve, holding the rank of captain. He made his MLB debut in 2021 and has developed into a reliable bullpen arm, earning a career-high 10 saves during the 2024 season with the Twins. Jax became the first Air Force Academy graduate to reach MLB when he debuted in June 2021.
Early Life and Background
James Griffin Jax was born on November 22, 1994, in Greenwood Village, Colorado. He attended Cherry Creek High School in his hometown, where he developed into a talented pitcher under the Colorado prep baseball system. His father, Garth Jax, played 10 seasons in the NFL for the Dallas Cowboys and Arizona Cardinals from the mid-1980s through the mid-1990s, giving Griffin a strong athletic family background.
During his senior year at Cherry Creek High School in 2013, Jax posted a remarkable 7-1 record with a 1.74 earned run average. His dominant performance earned him Colorado’s Gatorade Baseball Player of the Year honor. The Philadelphia Phillies took notice and selected him in the 12th round of the 2013 MLB Draft. Rather than signing a professional contract, Jax chose to pursue higher education and serve his country by enrolling at the United States Air Force Academy, where he could continue playing baseball while beginning his military career.
College Career at Air Force Academy
Jax’s first two seasons at the Air Force Academy presented significant challenges as he adjusted to the higher level of competition. He pitched to a 5.86 earned run average as a freshman and improved to a 5.17 mark as a sophomore. During the summer of 2015 between his sophomore and junior years, Jax played for the Eau Claire Express of the Northwoods League to continue his development against stronger competition.
His breakthrough came during his junior season in 2016. Jax started 15 games and went 9-2 with a school-record 2.05 earned run average, striking out 90 batters while walking only 10 across 105 and one-third innings. His exceptional performance earned him Mountain West Conference Co-Pitcher of the Year honors alongside Jimmy Lambert. His 2.05 ERA remained a single-season school record, and his 90 strikeouts demonstrated his dominance on the mound. Following his junior season, Jax entered the 2016 MLB Draft.
Path to Major League Baseball
The Minnesota Twins selected Jax in the third round of the 2016 MLB Draft. He signed for $645,000 and made his professional debut with the Elizabethton Twins of the Rookie-level Appalachian League, pitching eight and two-thirds innings. In 2017, his progression was interrupted when he was required to report to Cape Canaveral, Florida, for active military duty. He managed to make only five starts that season between Elizabethton and the Cedar Rapids Kernels of the Single-A Midwest League, going 2-2 with a 2.61 earned run average in those appearances.
In 2018, Jax was granted membership into the United States military’s World Class Athlete Program, which allowed him to make Olympic training his full-time responsibility while counting toward his required active duty service. This designation enabled him to play in the minor leagues full-time. During the 2018 season, he pitched for the Fort Myers Miracle of the High-A Florida State League, going 3-4 with a 3.70 earned run average in 15 games (14 starts). After the season, he played in the Arizona Fall League to gain additional experience against top prospects.
Jax began 2019 with the Pensacola Blue Wahoos of the Double-A Southern League, where he was named an All-Star. While with Pensacola, he missed nearly three weeks due to fatigue. In August 2019, he was promoted to the Rochester Red Wings of the Triple-A International League to finish the season. Across 23 starts between the two clubs, Jax posted a 5-7 record with a 2.90 earned run average, striking out 94 batters over 127 and one-third innings. The 2020 minor league season was canceled due to the COVID-19 pandemic, and Jax did not play a professional game that year. He opened the 2021 season with the St. Paul Saints of Triple-A East before earning his promotion to the majors.
James Griffin Jax Career
Minnesota Twins Breakthrough (2021-2025)
On June 5, 2021, Jax was selected to the 40-man roster and promoted to the major leagues for the first time. He made his MLB debut three days later on June 8 in relief against the New York Yankees at home, becoming the first Air Force Academy graduate to play in MLB history. In his debut, he pitched one inning, giving up three earned runs on two home runs while also recording his first career strikeout against Tyler Wade. Jax finished the 2021 season with a 6.37 earned run average over 14 starts and four relief appearances.
Jax transitioned to a full-time relief role with the Twins in 2022. In 65 appearances out of the bullpen, he compiled a 7-4 record and 3.36 earned run average with 78 strikeouts across 72 and one-third innings pitched. He continued as a key bullpen piece during the 2023 season, making 71 relief outings while registering a 6-10 record and 3.86 earned run average with 68 strikeouts across 65 and one-third innings of work.
The 2024 season marked Jax’s most successful professional year. He set career-highs with 10 saves, 95 strikeouts, a 2.03 earned run average, and a 0.87 WHIP across 72 appearances. His dominant performance established him as a reliable option at the back of the Twins bullpen and demonstrated his ability to handle high-leverage situations. In 2025, Jax pitched in 50 games for the Twins before the trade deadline, logging a 1-5 record and 4.50 earned run average with 72 strikeouts over 46 innings of work.
Tampa Bay Rays Era (2025-Present)
On July 31, 2025, the Minnesota Twins traded Jax to the Tampa Bay Rays in exchange for Taj Bradley. Prior to the trade, he had appeared in 23 games for the Twins that season, going 0-2 with a 3.60 earned run average and 27 strikeouts across 20 innings. This move marked a new chapter in his MLB career as he joined a Rays organization known for developing pitchers and competing for playoff berths in the American League.
Military Service
Jax’s military commitment has significantly shaped his baseball journey. After being drafted by the Twins, he reported for active duty at Cape Canaveral in 2017, limiting his professional appearances. His later inclusion in the World Class Athlete Program allowed him to balance military obligations with pursuing baseball as his primary focus. As an officer in the United States Air Force Reserve, Jax continues to serve his country while building his professional baseball career. He remains the only Air Force Academy graduate to play in MLB history.
Education
Beyond his baseball and military commitments, Jax is pursuing a graduate degree in business administration from Colorado State University. This demonstrates his dedication to preparing for life after baseball while managing the demands of professional athletics and military service.
James Griffin Jax Career Statistics
Throughout his MLB career spanning from 2021 through the 2025 season with Tampa Bay, Jax has established himself as a reliable bullpen option. His career totals include a 25-36 win-loss record with a 3.99 earned run average and 451 strikeouts across his appearances on the mound.
MLB Highlights
Jax’s most notable season came in 2024 when he recorded career-highs in saves (10), strikeouts (95), and posted his lowest earned run average (2.03) along with his best WHIP (0.87). His journey from a 12th-round draft pick who chose college over professional baseball to an MLB pitcher exemplifies his dedication and work ethic. He made his MLB debut against the New York Yankees in June 2021 and has continued to contribute at the major league level while balancing his commitment to the Air Force Reserve.
International Achievement
In March 2026, Jax represented the United States at the World Baseball Classic in Miami, helping Team USA win the gold medal in the tournament. This international success further solidified his reputation as one of the top pitchers in American baseball.
James Griffin Jax Family
Family Background
Jax comes from a distinguished athletic family. His father, Garth Jax, enjoyed a decade-long NFL career with the Dallas Cowboys and Arizona Cardinals during the 1980s and 1990s. This family legacy in professional sports has undoubtedly influenced Jax’s approach to his own athletic career and his ability to perform on big stages.
Personal Life
Jax married his wife, Savannah, in January 2021 in Gilbert, Arizona. Savannah is also a military officer, holding the rank of captain in the United States Air Force. The couple welcomed their first child, a daughter, in March 2023. Their shared commitment to military service creates a unique bond, and both continue to serve while Savannah supports Jax’s baseball career. Jax balances his time between baseball season, military duties, and his graduate studies at Colorado State University, demonstrating strong time management and dedication to all his commitments.
2025 Season Performance
The 2025 season marked a transitional year for Jax. He began the year with the Minnesota Twins and served as a reliable bullpen arm before being traded to Tampa Bay in late July. With the Twins, he appeared in 50 games and struggled at times, posting a 1-5 record with a 4.50 earned run average and 72 strikeouts across 46 innings. His strikeout rate remained solid at over 14 per nine innings, indicating his stuff remained effective despite the elevated ERA.
The trade to Tampa Bay represented an opportunity for Jax to join a winning organization with a strong track record of player development. The Rays acquired him in exchange for Taj Bradley, a talented young pitcher, showing their belief in Jax’s abilities to contribute to their bullpen. This move positioned him for potential postseason baseball with a franchise that has consistently competed for division titles in the American League East.
Looking ahead, Jax enters the 2026 season as a key piece in the Rays bullpen puzzle. His combination of major league experience, a track record of success in high-leverage situations, and his ability to strike batters out at a high rate make him a valuable asset. His continued military service adds a unique dimension to his character and work ethic, traits that translate well to the mental demands of professional baseball. The World Baseball Classic gold medal in early 2026 should provide additional confidence as he works toward helping the Rays compete in the challenging AL East division.