Casey Kelly Bio
Casey Patrick Kelly, born on October 4, 1989, is an American professional baseball pitcher. He has pitched in Major League Baseball for the San Diego Padres, Atlanta Braves, San Francisco Giants, Cincinnati Reds, and Arizona Diamondbacks, and also spent several seasons in the KBO League with the LG Twins in South Korea. A former first-round draft pick, Kelly has built a career that has stretched across both starting and relief roles in the United States and Asia.
Kelly is currently a free agent. Over more than a decade in professional baseball, he has appeared in the major leagues with five different organizations and earned recognition abroad as a KBO All-Star and a Korean Series champion. His career has been marked by a strong recovery from major arm surgery, multiple second chances in affiliated baseball, and sustained success in international play.
Early Life and Background
Casey Patrick Kelly was born on October 4, 1989, and grew up in Florida, where he attended Sarasota High School. He was a two-sport standout, earning recognition as a two-time regional player of the year as a quarterback in football while also starring on the baseball diamond. His athletic profile drew the attention of professional scouts in both sports.
Kelly was also a highly regarded shortstop in his youth, and his original preference was to play that position at the next level. He was offered a scholarship to play football at the University of Tennessee, a sign of his rare versatility as an athlete. Despite that offer, he chose to pursue professional baseball after being selected near the top of the 2008 draft.
Path to Baseball
Kelly’s path to professional baseball was unusual because he arrived in the sport as a two-way prospect. He was drafted as a pitcher by the Boston Red Sox in the first round, 30th overall, in the 2008 Major League Baseball Draft, even though his personal preference was to play shortstop. Boston signed him to a $3 million bonus, a figure that reflected his status as one of the top amateur players in the country.
Kelly split his first full professional season between the mound and the infield, pitching for the Greenville Drive and the Salem Red Sox before finishing 2009 as a shortstop. His struggles at the plate, where he hit .222 while striking out at a high rate, led him to commit full-time to pitching in December 2009. He advanced quickly through the Red Sox system, reaching Double-A Portland in 2010, and was widely regarded as one of the organization’s best young arms.
Casey Kelly Career
Boston Red Sox System (2008–2010)
Kelly began his professional career in the Boston Red Sox organization after being selected in the first round of the 2008 draft. He spent 2009 moving between pitching and shortstop before focusing solely on pitching, and he reached Double-A Portland in 2010. Mid-season rankings placed him among the top minor league arms in baseball, with ESPN ranking him 10th and Baseball America ranking him 24th.
At the time of his trade, Kelly was widely considered the top prospect in the Boston Red Sox organization. That trade, which sent him to the Padres in exchange for All-Star first baseman Adrián González on December 6, 2010, marked the end of his time in the Boston system and the start of a new chapter in the National League.
San Diego Padres Era (2011–2015)
Kelly was traded to the San Diego Padres as part of a four-player package for Adrián González in December 2010. He opened 2011 in Double-A with the San Antonio Missions and posted a 3.98 ERA with 105 strikeouts in 27 starts, cementing his status as the top prospect in the Padres’ system. He was also invited to major league spring training that year.
Kelly made his major league debut with the Padres on August 27, 2012, earning a win after pitching six shutout innings in a 3–0 victory over the Atlanta Braves. He also recorded his first major league hit in the same game. His 2012 season ended after six starts, and in March 2013 it was announced that he had micro tears in his ulnar collateral ligament. He underwent Tommy John surgery in April 2013 and missed most of the next two seasons. He returned in 2015 as a reliever, appearing in 20 games, including six starts, between Double-A and Triple-A El Paso.
Atlanta Braves (2016)
On December 10, 2015, Kelly was traded to the Atlanta Braves along with Ricardo Rodriguez in exchange for catcher Christian Bethancourt. He was assigned to the Triple-A Gwinnett Braves and shuttled between the minors and the major league club in 2016. In 10 appearances for Atlanta, he posted an 0–3 record and a 5.82 ERA, and he was removed from the 40-man roster at the end of the season before electing free agency.
Chicago Cubs and San Francisco Giants (2017–2018)
Kelly signed a minor league contract with the Chicago Cubs in January 2017 and posted a 5–2 record and a 4.65 ERA in 12 games for the Triple-A Iowa Cubs before being released in July 2017. Later that summer, he signed with the San Francisco Giants and pitched for the Triple-A Sacramento River Cats, going 2–3 with a 4.17 ERA in seven starts. He re-signed with the Giants on a minor league deal in February 2018 and was called up to the major league club in mid-August, appearing in seven games, including three starts, and going 0–3 with a 3.04 ERA before being removed from the 40-man roster at the end of the year.
LG Twins Era (2019–2024)
Kelly signed a one-year, $1 million contract with the LG Twins of the KBO League on November 20, 2018, beginning the most productive stretch of his career. In 2019, he made 29 starts and went 14–12 with a 2.55 ERA and 126 strikeouts across more than 180 innings, and he re-signed with the club the following winter. Across his early seasons in Seoul, he established himself as one of the most dependable foreign starters in the league, with double-digit win totals in each of his first three seasons and a steady strikeout rate.
In 2022, Kelly was named a KBO All-Star and led the league in wins, going 16–4 with a 2.54 ERA and 153 strikeouts across 27 starts. The following year, he went 10–7 with a 3.83 ERA in 30 starts and was the winning pitcher in the 2023 Korean Series, helping LG to a championship. He returned for the 2024 season but struggled to a 5–8 record and a 4.51 ERA in 19 starts before the Twins announced on July 20, 2024, that they had parted ways with him.
Cincinnati Reds and Arizona Diamondbacks (2024–2025)
Kelly signed a minor league contract with the Cincinnati Reds on August 7, 2024, and was added to the active roster on August 24, 2024. He appeared in two games for the Reds, allowing three runs on five hits with four strikeouts in just over five innings, before being designated for assignment and electing free agency in October 2024. On February 25, 2025, he signed a minor league contract with the Arizona Diamondbacks, spent most of the year with the Triple-A Reno Aces, and was added to the major league roster on August 6, 2025. He made two scoreless appearances for Arizona before being removed from the 40-man roster and electing free agency on November 6, 2025.
Notable Events and Milestones
Kelly’s major league debut on August 27, 2012, came on his father Pat Kelly’s 57th birthday, a moment that added personal meaning to a strong professional performance. He was also the 15th different starting pitcher used by the Padres in 2012, tying a club record, and he later became a KBO All-Star and Korean Series champion in South Korea. His career has been defined as much by resilience in the face of major arm surgery as by his on-field results.
Casey Kelly Family
Family Background and Baseball Lineage
Casey Kelly comes from a family with a direct connection to professional baseball. His father, Pat Kelly, appeared in three major league games as a catcher, giving the younger Kelly a personal link to the highest level of the sport. That connection was reinforced when Casey made his major league debut on his father’s 57th birthday.
Personal Life
Kelly is an American citizen who has spent most of his adult life moving between cities tied to his professional career, including stops in California, Georgia, Illinois, South Korea, Ohio, and Arizona. Public information about his immediate personal life, including marital status, is not broadly documented in major biographical sources.
2025 Season Performance
Kelly entered 2025 in a familiar position, working his way back to the major leagues on a minor league deal, this time with the Arizona Diamondbacks. He spent the bulk of the season with the Triple-A Reno Aces, compiling a 2–5 record and a 5.82 ERA with 42 strikeouts across 85 innings in 18 appearances, including 14 starts. The results were uneven, but his workload and durability kept him in consideration for a major league opportunity.
That opportunity came on August 6, 2025, when the Diamondbacks selected his contract and added him to the active roster. Kelly delivered two scoreless appearances for Arizona, though he did not record a strikeout across just under two innings of work. He was removed from the 40-man roster on November 6, 2025, and elected free agency the same day, leaving his next move open as a free agent.