Juan Castro, a native of Mexico, embarked on his Major League Baseball journey as a shortstop and utility infielder. His career began when he signed with the Los Angeles Dodgers as an amateur free agent in 1991. Castro made his MLB debut with the Dodgers on September 2, 1995. Known for his defensive prowess, Castro quickly established himself as a reliable infielder, capable of playing multiple positions with skill and precision.

Throughout his career, Castro was recognized for his exceptional defensive abilities. His quick reflexes and strong arm made him a valuable asset to any team he played for. While his offensive statistics were modest, his defensive skills often compensated for his batting average. Castro's ability to play second base, third base, and shortstop allowed him to fill in wherever needed, providing teams with flexibility in their lineups.

After his initial stint with the Dodgers, Castro was traded to the Cincinnati Reds in 2000. During his time with the Reds, he continued to demonstrate his defensive capabilities, often being called upon in late-game situations to secure leads. His tenure with the Reds lasted until 2004, after which he returned to the Dodgers for a brief period.

In 2005, Castro joined the Minnesota Twins, where he continued to be a dependable infielder. His time with the Twins was marked by consistent defensive performances, and he became a fan favorite for his work ethic and reliability on the field. Castro's role with the Twins further solidified his reputation as a defensive specialist.

Castro's career also included stints with the Baltimore Orioles, Philadelphia Phillies, and the New York Yankees. Each team benefited from his defensive skills and his ability to mentor younger players. His experience and knowledge of the game were invaluable assets in the clubhouse.

In 2009, Castro returned to the Dodgers for a third time, bringing his career full circle. He continued to contribute defensively, providing stability and depth to the Dodgers' infield. His final MLB appearance came in 2011 with the Dodgers, marking the end of a career that spanned over a decade and a half.

Throughout his career, Castro was often praised for his professionalism and team-first mentality.