Austin Cox Bio
Austin Cox is an American professional baseball pitcher who currently plays for the Yokohama DeNA BayStars of Nippon Professional Baseball in Japan. The right-handed hurler has competed at the highest levels of the sport, having made his Major League Baseball debut with the Kansas City Royals in 2023 before later joining the Atlanta Braves organization. Cox is recognized for an impressive start to his major league career that included setting a modern MLB record.
Early Life and Background
Austin Cox was born on March 28, 1997. He grew up in Georgia and attended First Presbyterian Day School in Macon, where he distinguished himself as a two-sport athlete, excelling in both baseball and football during his high school years. On the mound for the Falcons, Cox compiled a record of 15 wins against 6 losses with an earned run average of 2.19, demonstrating the potential that would eventually carry him to professional baseball.
Despite his strong high school performance, Cox went undrafted in the 2015 Major League Baseball draft. He honored his commitment to continue his baseball career at the collegiate level, choosing Mercer University to play for the Bears program.
Path to Professional Baseball
At Mercer University, Cox developed into a polished pitcher over three seasons. As a freshman in 2016, he appeared in 24 innings and posted a 2-2 record. His sophomore campaign saw him make 15 starts, resulting in a 4-2 record with a 5.69 earned run average. By his junior season in 2018, Cox had earned the prestigious role of Mercer’s Friday night starter, the team’s ace position. That year he delivered his best collegiate performance, going 7-4 with a 4.52 ERA while striking out 124 batters across 87 and two-thirds innings of work.
The Kansas City Royals took notice of Cox’s development and selected him in the fifth round, with the 152nd overall pick, in the 2018 Major League Baseball draft. He signed promptly and began his professional career that same year.
Austin Cox Career
Minor League Development (2018–2022)
Upon joining the Royals organization, Cox made his professional debut with the Burlington Royals of the Rookie-level Appalachian League. He performed well in his first taste of pro baseball, posting a 1-1 record with a 3.78 ERA over nine starts. The following season in 2019 proved to be a breakthrough year for the young pitcher.
Cox began 2019 with the Lexington Legends of the Single-A South Atlantic League, where he earned All-Star honors and was named Pitcher of the Week early in June. His strong performance led to a promotion to the Wilmington Blue Rocks of the High-A Carolina League on June 23, 2019. Combined between both teams, Cox went 8-6 with an impressive 2.76 ERA, tallying 129 strikeouts against 38 walks over 130 and two-thirds innings across 24 appearances. The 2020 season was lost to the minor league cancellation caused by the COVID-19 pandemic.
When play resumed in 2021, Cox advanced to the Double-A Northwest Arkansas Naturals and earned a late-season promotion to Triple-A Omaha Storm Chasers in September. Over 17 games between both levels, he went 4-1 with a 4.10 ERA and 56 strikeouts in 63 innings. He returned to Omaha for the entire 2022 season, where he appeared in 29 games and logged a 7-7 record with a 4.21 ERA and 105 strikeouts over 147 and one-third innings.
Kansas City Royals Breakthrough (2023)
Cox began the 2023 season with Triple-A Omaha and pitched exceptionally, compiling a 2.21 ERA with 22 strikeouts and 11 walks in 20 and one-third innings across five appearances. His performance earned him a spot on the 40-man roster, and on May 3, 2023, he received his first major league promotion to the Kansas City Royals.
His debut became historically memorable. Cox set a modern Major League Baseball record by not allowing a hit to any of the first 39 batters he faced, showcasing dominant stuff and pinpoint control. Overall, he made 24 appearances for Kansas City that season, recording a 4.54 ERA with 33 strikeouts in 35 and two-thirds innings. However, his season ended tragically on September 8 when he was struck by a line drive off the bat of Alejandro Kirk while covering first base. The injury resulted in a full ACL tear in his left knee along with MCL damage, placing him on the 60-day injured list for the remainder of the year. Following the season, the Royals designated him for assignment but re-signed him to a minor league contract.
Return to Minor Leagues (2024)
Cox spent the 2024 campaign with Triple-A Omaha, where he compiled a 3.90 ERA with 31 strikeouts across 30 innings pitched. On July 11, 2024, he opted out of his minor league contract and elected free agency. He quickly re-signed with the Royals on a new minor league deal on July 16 and remained with the organization through the end of the season before electing free agency again in November.
Atlanta Braves (2025)
On January 2, 2025, Cox returned to the Royals on another minor league contract. He made 11 appearances for Triple-A Omaha, posting a 2-1 record with a 3.55 ERA and 18 strikeouts across 12 and two-thirds innings before being released on May 4, 2025. Later that same day, he signed a major league contract with the Atlanta Braves and was optioned to the Triple-A Gwinnett Stripers. He appeared in 13 games for Atlanta’s major league club, struggling to an 8.86 ERA with 22 strikeouts in 21 and one-third innings. The Braves removed him from the 40-man roster in November and sent him outright to Triple-A, and he elected free agency.
Yokohama DeNA BayStars Era (2025–Present)
On December 10, 2025, Cox signed with the Yokohama DeNA BayStars of Nippon Professional Baseball, making the jump to Japan’s top baseball league. Through early April 2026, he had made a strong initial impression with his new team, posting a 1-0 record with a 3.00 ERA and 7 strikeouts in his NPB appearances.
Throwing Style and Strengths
Cox is a right-handed pitcher who has shown the ability to work both as a starter and reliever throughout his professional career. His professional debut in MLB showcased his ability to miss bats and induce weak contact, as evidenced by his record-setting performance with the first 39 batters. He has demonstrated the capacity to work deep into games when functioning as a starter, evidenced by his success in minor league rotations with Omaha and in college at Mercer.
Notable Events and Milestones
The most celebrated moment of Cox’s career came during his MLB debut with Kansas City in May 2023, when he set the modern MLB record by retiring the first 39 batters without allowing a hit. That remarkable feat placed him among the most memorable debut performances in recent baseball history. His career trajectory took a significant detour due to the serious knee injury suffered in September 2023, but he has continued to pursue opportunities at the highest levels of the sport.
Austin Cox Career Wins
Throughout his professional career spanning minor league baseball in the United States and now in Japan, Austin Cox has accumulated victories across multiple levels. His professional record includes successful campaigns in the Royals minor league system and a current showing in Nippon Professional Baseball.
Major League and Minor League Highlights
At the major league level, Cox has appeared in 37 total games across his time with the Kansas City Royals and Atlanta Braves, recording a combined win-loss record of 0-1 with a 6.16 earned run average and 55 strikeouts. In minor league baseball, his most productive professional season came in 2019 when he went a combined 8-6 between Lexington and Wilmington. His 2022 season with Triple-A Omaha saw him go 7-7 with 105 strikeouts over 147 and one-third innings. His 2021 campaign included a 4-1 record between Double-A and Triple-A.
Other Notable Performances
In Nippon Professional Baseball with the Yokohama DeNA BayStars, Cox has begun his tenure with a 1-0 record through early April 2026, recording a 3.00 ERA with 7 strikeouts in his early appearances. His college career at Mercer University included a standout junior season with a 7-4 record and 124 strikeouts.
Austin Cox Family
Personal Life
Austin Cox attended First Presbyterian Day School in Macon, Georgia, for his high school education. He continued his academic and athletic career at Mercer University in Macon, Georgia, where he played baseball for three seasons before beginning his professional career. Beyond his athletic pursuits, Cox maintains a public presence on social media.
2025 Season Performance
The 2025 season represented a year of transitions for Austin Cox. He began the year with the Kansas City Royals organization on another minor league contract, performing adequately at Triple-A Omaha with a 2-1 record and 3.55 ERA in 11 appearances. His tenure with the Royals ended when he was released in May, leading to an immediate opportunity with the Atlanta Braves. Cox signed a major league contract and joined the Braves, though his time in the organization was challenging as he posted an 8.86 ERA across 13 major league appearances. The Braves ultimately removed him from their 40-man roster late in the season, and he elected free agency. Seeking a fresh start and continued opportunity at the highest professional level, Cox signed with the Yokohama DeNA BayStars of Nippon Professional Baseball in December 2025, opening a new chapter in his baseball career in Japan.