Kyle Leahy Bio
Kyle Yandow Leahy (LAY-hee; born June 4, 1997) is an American professional baseball pitcher for the St. Louis Cardinals of Major League Baseball (MLB). A right-handed pitcher, he made his MLB debut in 2023 after working his way through the Cardinals’ minor league system. As of the 2025 season, he remains on the Cardinals’ major league roster.
Early Life and Background
Kyle Yandow Leahy was born on June 4, 1997, and grew up in Erie, Colorado. He attended Erie High School, where he graduated in 2015. Playing for the school’s baseball team in his senior year, Leahy posted a 9–1 win–loss record and a 0.41 earned run average (ERA), earning recognition as the Longmont Times-Call’s player of the year for his dominant high school campaign.
Following high school, Leahy enrolled at Colorado Mesa University, where he played college baseball for the Colorado Mesa Mavericks. His time at Colorado Mesa helped him develop as a pitcher and positioned him for the 2018 Major League Baseball draft, where the St. Louis Cardinals selected him in the 17th round with the 513th overall pick.
Path to Baseball
Leahy’s path to professional baseball began with a strong senior season at Erie High School, where his standout performance as a pitcher drew regional attention. His selection of Colorado Mesa University allowed him to continue his baseball development at the collegiate level, competing in the Colorado Mesa Mavericks program. The combination of his high school accolades and college experience made him a draft-worthy prospect in 2018.
The St. Louis Cardinals selected Leahy in the 17th round of the 2018 MLB draft, giving him his first opportunity in professional baseball. He debuted with the rookie-level Johnson City Cardinals, beginning a steady progression through the Cardinals’ minor league affiliates. Each step in the minors provided valuable experience as he worked toward earning a major league opportunity.
Kyle Leahy Career
Early Career (2018–2020)
Leahy made his professional debut in 2018 with the rookie-level Johnson City Cardinals, pitching to a 5.52 ERA across 13 contests. The following season, he split time between the Single-A Peoria Chiefs, High-A Palm Beach Cardinals, and Double-A Springfield Cardinals. Across 23 games and 22 starts, he posted a 5–13 record with a 3.73 ERA, recording 102 strikeouts in 123 innings of work.
The 2020 minor league season was canceled due to the COVID-19 pandemic, and Leahy did not appear in a game that year. Despite the interruption, he continued his development within the Cardinals organization, building experience across multiple levels of the minor leagues.
Minors Progression (2021–2022)
In 2021, Leahy struggled at the Double-A level with Springfield, appearing in 25 games and posting an 0–8 record with an 8.20 ERA and 63 strikeouts across 86 and two-thirds innings. The difficult season tested his resilience, but he returned to Springfield for a third season in 2022 and saw marked improvement.
During the 2022 season, Leahy also made a brief appearance with the Triple-A Memphis Redbirds. In 28 games and 26 starts for Springfield, he recorded a 10–7 record with a 5.29 ERA and a career-high 146 strikeouts across 144 and two-thirds innings. His strong performance that year helped set the stage for his eventual major league promotion.
St. Louis Cardinals Era (2023–Present)
Leahy began the 2023 season with Triple-A Memphis, pitching in 28 games and recording a 4.06 ERA with 51 strikeouts in 51 innings. On July 6, 2023, the Cardinals selected his contract and added him to the 40-man roster, promoting him to the majors for the first time. In three appearances for St. Louis, he allowed four runs on four hits and five walks with two strikeouts in one and two-thirds innings, and on October 26, he was removed from the 40-man roster and sent outright to Triple-A Memphis.
On April 30, 2024, the Cardinals selected Leahy’s contract again, adding him back to the major league roster. He was optioned to Memphis five times during the season while shuttling between levels. For the Cardinals in 2024, Leahy appeared in 33 relief outings, going 1–1 with a 4.07 ERA and 33 strikeouts over 48 and two-thirds innings pitched.
Leahy was named to St. Louis’ 2025 Opening Day roster, cementing his place in the major league bullpen. His journey from a 17th-round draft pick to a recurring big league arm has been defined by perseverance through early-career struggles and continued development at the upper levels of the minors.
Driving Style and Strengths
Leahy has worked primarily as a starting pitcher throughout the minor leagues, with significant workloads in 2022 (144 and two-thirds innings) and consistent relief usage in the majors. His career-high 146 strikeouts in 2022 demonstrate his ability to miss bats, while his 2023 Triple-A work showed improved command with a 4.06 ERA. In the major leagues, he has settled into a relief role, providing the Cardinals with a versatile arm capable of handling multiple innings.
Notable Events and Milestones
Leahy’s biggest milestone came on July 6, 2023, when he was promoted to the majors for the first time after being selected to the 40-man roster. He reached the 100-strikeout mark in the minors during 2019 and set a new personal best with 146 strikeouts in 2022. Being named to the Cardinals’ 2025 Opening Day roster represented another significant achievement, confirming his standing within the organization.
Kyle Leahy Career Wins
Across his professional career, Kyle Leahy has accumulated his wins primarily in the minor leagues, with a 5–13 record in 2019, an 0–8 mark in 2021, a 10–7 record in 2022 at Springfield, and a 1–1 record in the majors during 2024. His major league opportunities have come in relief, while his minor league wins reflect his development as a starter.
Minor League Highlights
Leahy’s most productive minor league season came in 2022, when he went 10–7 with Springfield and set a career high with 146 strikeouts. His 2019 campaign across Peoria, Palm Beach, and Springfield produced a 5–13 record but featured 102 strikeouts in 123 innings. In 2023, he served as a steady Triple-A presence with Memphis before earning his call-up to St. Louis.
Major League Highlights
In his first MLB stint in 2023, Leahy appeared in three games before being sent back to Triple-A. The 2024 season marked his most extensive major league work, with 33 relief appearances and a 1–1 record, 4.07 ERA, and 33 strikeouts over 48 and two-thirds innings. His inclusion on the 2025 Opening Day roster extended his major league tenure into a third consecutive year.
Kyle Leahy Family
Family Background and Personal Life
Details about Kyle Leahy’s family background and personal life are not publicly documented in available sources. He grew up in Erie, Colorado, where he attended Erie High School and developed his early baseball skills. There is no verified public information regarding his parents, spouse, or children at this time.
2025 Season Performance
Kyle Leahy entered the 2025 season on the St. Louis Cardinals’ Opening Day roster, a notable achievement following his 33 relief appearances in 2024. His continued presence on the 40-man roster reflects the organization’s confidence in his ability to contribute out of the bullpen. As a veteran of the Cardinals’ minor league system, he provides experienced depth for the St. Louis pitching staff.
Throughout the 2025 campaign, Leahy is expected to serve primarily in a relief role, drawing on his Triple-A experience with Memphis and his 2024 major league workload. His career path from a 17th-round pick in 2018 to a recurring major league arm underscores the persistence required to remain in the big leagues. The Cardinals will likely continue to use him in middle-to-late relief situations as the season progresses.
Looking ahead, Leahy’s 2025 outlook centers on building consistency at the major league level after a year of shuttling between Memphis and St. Louis in 2024. His strikeout ability and prior Triple-A success suggest he has the tools to handle the demands of an MLB bullpen role. The season represents an opportunity for him to establish himself as a steady contributor in the Cardinals’ relief corps.