Felix Heredia, a left-handed pitcher from the Dominican Republic, embarked on his Major League Baseball (MLB) journey when he debuted with the Florida Marlins. Known for his ability to throw a fastball and a slider, Heredia quickly became a reliable option out of the bullpen. His tenure with the Marlins saw him develop into a consistent reliever, contributing to the team's pitching staff with his left-handed delivery.

In 1999, Heredia was traded to the Chicago Cubs, where he continued to hone his skills as a relief pitcher. During his time with the Cubs, he was utilized in various situations, often called upon to face tough left-handed hitters. His performance with the Cubs solidified his reputation as a dependable reliever, and he became a familiar face in the bullpen.

Heredia's career took another turn when he was traded to the Toronto Blue Jays in 2001. Although his stint with the Blue Jays was brief, he continued to demonstrate his capabilities as a left-handed specialist. The following year, he found himself with the Cincinnati Reds, where he continued to add depth to their bullpen.

In 2003, Heredia joined the New York Yankees, one of the most storied franchises in baseball history. Pitching in the high-pressure environment of New York, he contributed to the Yankees' bullpen during their postseason run. His time with the Yankees was marked by his ability to handle critical situations, often facing some of the league's toughest hitters.

Heredia's journey in MLB continued as he signed with the New York Mets in 2004. His role with the Mets was similar to his previous teams, providing left-handed relief and facing challenging matchups. Despite the challenges of playing in a new city, Heredia maintained his focus and continued to deliver solid performances on the mound.

In 2005, Heredia's career faced a setback when he was suspended for violating MLB's performance-enhancing drug policy. This suspension marked a turning point in his career, and he did not return to the major leagues after serving his suspension.

Throughout his time in MLB, Felix Heredia played for several teams, each time bringing his left-handed pitching skills to the bullpen.