Declan Cronin Siblings: Getting to Know Brian

Declan Cronin is an American professional baseball pitcher, currently playing for the Miami Marlins in Major League Baseball (MLB).

He attended Regis High School in New York City before playing college baseball at Holy Cross, where he earned a Bachelor of Arts in History in 2019.

During his college career, Cronin distinguished himself as a reliable pitcher, recording 156 strikeouts and achieving All-Patriot League first-team honors in his senior year.

Cronin was drafted by the Chicago White Sox in the 36th round of the 2019 MLB Draft. After making his MLB debut with the White Sox, he later joined the Marlins.

Siblings

Declan has one brother, Brian.

While specific details about Brian’s life and pursuits are not widely publicized, they share experiences that shape their interests and ambitions.

Career

Cronin’s journey in baseball began in high school at Regis High School in New York City, where he laid the foundation for his athletic career.

He later attended the College of the Holy Cross, where he played college baseball and earned a Bachelor of Arts in History in 2019.

During his time at Holy Cross, Cronin became a standout pitcher, throwing over 177 innings and recording 156 strikeouts.

His senior year was particularly impressive, as he achieved a 6–4 record with a 4.06 ERA and was named to the All-Patriot League first team.

Cronin’s professional career began when he was selected by the Chicago White Sox in the 36th round of the 2019 MLB Draft.

He started in the minor leagues, pitching for teams such as the rookie-level Arizona League White Sox and Single-A Kannapolis, where he posted a 2.88 ERA across 20 games.

Like many athletes, Cronin faced challenges during the COVID-19 pandemic, which canceled the 2020 minor league season.

However, he returned to action in 2021 and split his time between High-A Winston-Salem and Double-A Birmingham, finishing with a combined record of 5–2 and a 4.56 ERA.

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His persistence paid off when he made his MLB debut with the White Sox on July 30, 2023, appearing in nine games before being designated for assignment later that year.

In early 2024, Cronin’s career took another turn when he was claimed off waivers by the Houston Astros on January 4 but was soon designated again.

The Miami Marlins then claimed him on February 7, 2024.

During his first full season with the Marlins, Cronin made an impact by appearing in 56 games and recording a 4.35 ERA with 72 strikeouts over 70.1 innings pitched.

A highlight of his season was setting a franchise record by pitching 65 innings before allowing his first home run.

As of February 2025, Cronin has continued to develop as a reliable MLB pitcher.

His career statistics reflect his growth and potential: in MLB play, he has appeared in 65 games with a record of 3–5, an ERA of 4.98, and 80 strikeouts over 81.1 innings pitched.

In the minor leagues, he has played in 154 games with a record of 12–6, an ERA of 3.82, and 154 strikeouts over 188.2 innings pitched.

Accolades

Cronin has achieved several notable accolades throughout his baseball career, both in college and professionally.

During his time at the College of the Holy Cross, he earned All-Patriot League first-team honors in 2019, showcasing his talent with a record of 6–4 and a 4.06 ERA over 71 innings pitched.

His performance in conference play was particularly impressive, as he recorded a 2.70 ERA, which ranked second in the Patriot League, and went 5–1 over 46.2 innings.

In addition to his athletic accomplishments, Cronin was recognized for his academic achievements by being named to the Patriot League Academic Honor Roll multiple times (2016-2019) and earning Academic All-Patriot League honors in 2019.

He also received the Robert T. Curran Leadership Award from his team during his senior year.

After transitioning to professional baseball, Cronin made an impact with the Miami Marlins in 2024.

He set a franchise record by pitching 65 innings before allowing his first home run, marking the most innings to start a season without surrendering a home run since 2014.

At the conclusion of the 2024 season, he was honored as the Marlins Rookie of the Year by the Baseball Writers’ Association of America (BBWAA), further solidifying his reputation as an emerging talent in Major League Baseball.