Andy Hassler, a left-handed pitcher, embarked on his Major League Baseball career with the California Angels. He made his debut in the big leagues as a young pitcher, showcasing his potential on the mound. Hassler's early years with the Angels were marked by his development as a pitcher, as he worked to refine his skills and establish himself in the rotation.

Throughout his career, Hassler played for several teams, including the Kansas City Royals, Boston Red Sox, New York Mets, and St. Louis Cardinals. His journey through these teams highlighted his adaptability and ability to contribute in various roles, whether as a starter or coming out of the bullpen. His time with the Royals was particularly noteworthy, as he became a reliable option for the team during his tenure.

Hassler's pitching style was characterized by his left-handed delivery, which often posed challenges for opposing batters. He was known for his ability to change speeds and keep hitters off balance, a skill that served him well throughout his career. Despite facing the ups and downs typical of a professional athlete's journey, Hassler maintained his presence in the league for over a decade.

One of the highlights of Hassler's career was his participation in the postseason. He had the opportunity to pitch in the playoffs with the Kansas City Royals, gaining valuable experience on baseball's biggest stage. These appearances underscored his role as a dependable pitcher capable of performing under pressure.

After his time with the Royals, Hassler continued to contribute to various teams, including a stint with the Boston Red Sox. His experience and left-handed pitching were assets that teams sought to utilize, and he continued to find opportunities to play at the major league level.

Hassler's career also included a brief period with the New York Mets and a return to the California Angels, where he had initially started his MLB journey. His ability to adapt to different teams and situations was a testament to his understanding of the game and his role within it.

In the latter part of his career, Hassler joined the St. Louis Cardinals, where he continued to pitch until his retirement. His time in the major leagues spanned several seasons, during which he faced numerous challenges and changes within the sport. Despite these challenges, Hassler's career is remembered for his perseverance and ability to remain a part of the professional baseball landscape for many years.