Fred Treacey's career in professional baseball unfolded during the early years of the sport's organized leagues. Treacey played as an outfielder and occasionally took on the role of a first baseman. His journey in baseball began with the Chicago White Stockings, a team that was part of the National Association of Professional Base Ball Players, the first professional baseball league.

Treacey's tenure with the Chicago White Stockings was marked by his participation in the inaugural season of the National Association in 1871. During this season, he demonstrated his skills on the field, contributing to his team's efforts in the fledgling league. His time with the White Stockings, however, was relatively brief, as he moved on to play for other teams in subsequent seasons.

In 1872, Treacey joined the Troy Haymakers, another team in the National Association. His stint with the Haymakers provided him with further opportunities to showcase his abilities as a player. The Haymakers, like many teams of that era, faced challenges both on and off the field, but Treacey continued to be a part of the evolving landscape of professional baseball.

The following year, Treacey became a member of the Philadelphia Athletics. His role with the Athletics allowed him to continue competing at a high level within the National Association. The Athletics were one of the more stable teams during this period, and Treacey's involvement with them added to his experience in the league.

Treacey's career also included time with the Baltimore Canaries, another team in the National Association. His movement between teams was not uncommon during this era, as the league was still in its formative years and players often shifted between clubs.

Throughout his career, Treacey played in various positions, primarily as an outfielder but also taking on duties at first base when needed. His adaptability on the field was a valuable asset to the teams he played for, allowing him to contribute in multiple ways.

The National Association, where Treacey spent his career, was a precursor to the National League, which would eventually become the more dominant professional baseball league. Treacey's involvement in these early years of professional baseball placed him among the pioneers of the sport, participating in a time when the game was still establishing its professional roots.

Fred Treacey's career in professional baseball, though not extensively documented, reflects the experiences of many players during the early days of the sport.

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