Casey Kelly Bio
Casey Patrick Kelly (born October 4, 1989) is an American professional baseball pitcher who is currently a free agent. Over the course of his career he has pitched in Major League Baseball for the San Diego Padres, Atlanta Braves, San Francisco Giants, Cincinnati Reds, and Arizona Diamondbacks, and spent the bulk of his most productive seasons in the KBO League with the LG Twins. Across both MLB and the KBO, Kelly has worked primarily as a starter, building a profile as a durable innings-eater.
Kelly first gained national attention as a first-round draft pick out of high school and was once considered one of the top pitching prospects in the Boston Red Sox organization. After his path to the majors was slowed by injury, he rebuilt his career overseas in Korea before returning for brief late-season stints in MLB. He is a KBO All-Star, a Korean Series champion, and a former KBO wins leader.
Early Life and Background
Casey Patrick Kelly was born on October 4, 1989, and grew up as the son of Pat Kelly, a former catcher who appeared in three Major League games. Baseball was a familiar part of life from the start, and Kelly was a standout two-sport athlete at Sarasota High School, where he was twice named a regional player of the year as a quarterback. His arm talent drew recruiting interest from college football programs as well, and he was offered a scholarship to play quarterback at the University of Tennessee.
Despite his football promise, Kelly chose baseball and signed with the Boston Red Sox after they selected him in the first round of the 2008 MLB draft, 30th overall. He received a $3 million signing bonus, well above slot value at the time. That decision set the course for a professional career that has carried him across organizations and continents.
Path to Professional Baseball
Kelly began his climb through the Red Sox system in 2009, splitting time as a pitcher and a shortstop across the Greenville Drive and Salem Red Sox. He was selected to the All-Star Futures Game that year before announcing in December 2009 that he would commit to pitching full time. The same offseason, on December 6, 2010, he was traded along with Anthony Rizzo, Reymond Fuentes, and Eric Patterson to the San Diego Padres in the deal that sent three-time All-Star Adrián González to Boston.
Kelly was immediately regarded as the top prospect in the Padres organization, opening 2011 in Double-A with the San Antonio Missions and posting a 3.98 ERA across 27 starts. After a brief elbow setback in 2012, he recovered in time to make his MLB debut with San Diego on August 27, 2012, earning a win with six shutout innings against the Atlanta Braves. The start made him the 15th different pitcher used in the Padres rotation that season, tying a club record.
Casey Kelly Career
Early Career (2008-2011)
Kelly’s professional career began in 2008 when he signed with the Boston Red Sox as a first-round pick. He moved through the lower levels of the Red Sox system in 2009 and 2010, reaching Double-A Portland in 2010 with a 5.31 ERA across 21 starts. Mid-season rankings from ESPN and Baseball America placed him among the top 25 prospects in the game.
The trade to San Diego in December 2010 changed the trajectory of his development. Working in the Padres system, Kelly refined his command and durability, and by 2011 he had become the headline name in San Diego’s minor league pipeline. His stock remained high enough to be ranked 22nd in MLB.com’s Top 50 Prospects entering 2011.
San Diego Padres Era (2012-2015)
Kelly debuted for the Padres on August 27, 2012, recording a win and his first major league hit in a 3-0 victory over the Atlanta Braves. He made six starts that season, finishing 2-3 with a 6.21 ERA. The following spring, on March 22, 2013, Kelly was diagnosed with micro tears in his ulnar collateral ligament. He underwent Tommy John surgery on April 2 and missed most of the next two seasons while rehabbing.
Kelly returned in 2014 and was converted to a relief role in 2015, making 20 appearances across Double-A and Triple-A El Paso. The Padres traded him to the Atlanta Braves on December 10, 2015, closing his San Diego chapter.
Atlanta Braves and Minor League Stints (2016-2017)
Kelly opened 2016 in Triple-A Gwinnett before a brief MLB recall with Atlanta. In 10 appearances for the Braves, he went 0-3 with a 5.82 ERA. He was removed from the 40-man roster after the season and elected free agency. In January 2017, he signed a minor league deal with the Chicago Cubs and pitched at Triple-A Iowa before being released in July.
Kelly quickly found another opportunity, signing with the San Francisco Giants organization on July 29, 2017. He worked at Triple-A Sacramento through the end of that season and re-signed on a minor league deal the following February.
San Francisco Giants Return (2018)
Kelly was promoted to San Francisco in mid-August 2018 due to injuries elsewhere in the rotation. He appeared in seven games, three of them starts, and posted a 3.04 ERA across 23⅔ innings. The Giants removed him from the 40-man roster after the season, and he once again elected free agency.
LG Twins Era (2019-2024)
On November 20, 2018, Kelly signed a one-year, $1 million contract with the LG Twins of the KBO League, beginning the most successful chapter of his career. Over six seasons in Korea, he became a frontline starter, re-signing each winter and gradually increasing his salary. His best year came in 2022, when he went 16-4 with a 2.54 ERA, was named a KBO All-Star, and led the league in wins.
In 2023, Kelly helped the LG Twins win the Korean Series, earning the winning decision in the championship round. After a down year in 2024, the Twins parted ways with him in July, ending a long and decorated run in Seoul.
Cincinnati Reds and Arizona Diamondbacks (2024-2025)
Kelly signed a minor league deal with the Cincinnati Reds on August 7, 2024, and had his contract selected on August 24. He appeared in two games for Cincinnati before being designated for assignment and clearing waivers. He signed with the Arizona Diamondbacks on February 25, 2025, and made two scoreless MLB appearances after a midseason promotion from Triple-A Reno. He elected free agency on November 6, 2025.
Notable Events and Milestones
Kelly’s 2012 MLB debut came on his father Pat Kelly’s 57th birthday, a poignant moment linking his career to his family’s baseball history. He was the 15th different starting pitcher used by the Padres in 2012, tying a club record. In Korea, his standout 2022 season and the 2023 Korean Series title stand as the defining achievements of his career.
Casey Kelly Career Wins
Kelly has accumulated 73 wins against 46 losses with a 3.25 ERA and 753 strikeouts across his KBO career through the 2024 season. In Major League Baseball through the 2025 season, his record stands at 2-11 with a 5.34 ERA and 60 strikeouts. The bulk of his winning success has come as a starting pitcher in the KBO League.
KBO League Highlights
Kelly’s KBO highlights include leading the league with 16 wins in 2022, earning All-Star honors the same year, and winning the Korean Series in 2023. He logged double-digit win totals in 2019, 2020, 2021, and 2022, and pitched at least 166 innings in three straight seasons. He closed his LG Twins run in 2024 with a 5-8 record before being released midseason.
Other Performances
Outside the KBO, Kelly’s most notable achievements include his 2012 MLB debut win with the Padres and his 2018 return to the majors with the Giants. His MLB stints with Atlanta, Cincinnati, and Arizona produced limited regular-season success but kept his career active.
Casey Kelly Family
Family Background and Baseball Lineage
Kelly is the son of Pat Kelly, a former catcher who appeared in three Major League games. The connection to professional baseball gave Casey early access to the game’s rhythms and expectations, and his MLB debut on August 27, 2012, fell on Pat’s 57th birthday.
Personal Life
Kelly maintains a public presence on Instagram under the handle the_real_ck3. Limited additional personal details are publicly documented.
2025 Season Performance
Kelly began 2025 in the Arizona Diamondbacks system after signing a minor league deal on February 25. He worked primarily as a starter for the Triple-A Reno Aces, going 2-5 with a 5.82 ERA across 18 appearances and 14 starts, striking out 42 batters in 85 innings. His performance earned him a brief MLB call-up in August.
On August 6, 2025, the Diamondbacks selected Kelly’s contract and added him to the active roster. He made two scoreless appearances for Arizona without recording a strikeout across 1⅔ innings before being removed from the 40-man roster on November 6. He elected free agency the same day, closing out the 2025 season as an available veteran arm.