Brad Thomas, a left-handed pitcher from Australia, embarked on his professional baseball journey when he signed with the Los Angeles Dodgers as an amateur free agent in 1995. However, it was with the Minnesota Twins that he made his Major League Baseball (MLB) debut. Thomas first appeared in the majors on May 26, 2001, with the Twins, marking the beginning of his MLB career.

During his time with the Twins, Thomas had a challenging stint, as he struggled to find consistency on the mound. Over the course of three seasons with Minnesota, he appeared in a total of 21 games, primarily as a relief pitcher. His tenure with the Twins was marked by a fluctuating performance, which eventually led to his release from the team.

After his time in the MLB, Thomas sought opportunities overseas, which led him to the Nippon Professional Baseball (NPB) league in Japan. He signed with the Hokkaido Nippon-Ham Fighters, where he played for two seasons. His experience in Japan allowed him to refine his skills and gain valuable international playing experience.

Thomas returned to the United States and briefly joined the Boston Red Sox organization, although he did not make an appearance in an MLB game for them. He continued to pursue his career in various international leagues, including a stint in the Korea Baseball Organization (KBO) with the Hanwha Eagles. His time in Korea further showcased his adaptability and willingness to embrace different baseball cultures.

In 2010, Thomas made a return to the MLB, signing with the Detroit Tigers. During his two seasons with the Tigers, he served as a relief pitcher, appearing in 80 games. His role with the Tigers allowed him to contribute to the team's bullpen depth, and he became known for his ability to handle various relief situations.

Throughout his career, Thomas demonstrated a willingness to explore opportunities beyond the MLB, which included playing in leagues across Asia. His international experiences enriched his understanding of the game and provided him with a diverse perspective on baseball.