Segui's MLB debut came with the Athletics in 1962. Over the next few years, he established himself as a reliable pitcher, showcasing his skills both as a starter and a reliever. His ability to adapt to different roles on the pitching staff made him a valuable asset to his teams. In 1965, Segui was traded to the Washington Senators, but his stint there was brief, and he soon found himself back with the Athletics.
The late 1960s saw Segui moving to the Seattle Pilots, an expansion team that only played one season in 1969 before relocating to Milwaukee to become the Brewers. During his time with the Pilots, Segui led the team in wins and earned run average (ERA), demonstrating his prowess on the mound. His performance with the Pilots was a highlight in a season that was otherwise challenging for the fledgling team.
After the Pilots' relocation, Segui continued his career with the St. Louis Cardinals and then the Boston Red Sox. In Boston, he served primarily as a reliever, contributing to the bullpen with his experience and skill. His tenure with the Red Sox was marked by consistent performances that helped stabilize the team's pitching staff.
In 1972, Segui returned to the Athletics, who had by then moved to Oakland. This period was particularly memorable as he was part of the team during their successful run in the early 1970s. Although he did not play in the postseason, being part of a championship-winning team added a significant chapter to his career.
Segui's journey in the MLB took another turn when he joined the expansion Seattle Mariners in 1977. This move was historic as it made him the only player to have played for both the Pilots and the Mariners, Seattle's two major league teams. His experience and leadership were invaluable to the Mariners during their inaugural season.
Throughout his career, Segui was known for his durability and adaptability. He played in an era when pitchers were often required to fulfill multiple roles, and he did so with competence and skill. His forkball, a pitch that baffled many hitters, was a key element of his arsenal and contributed to his longevity in the league.
Segui's career statistics reflect his steady presence on the mound. Over 15 seasons, he accumulated a win-loss record of 92-111, an ERA of 3.81, and 1,482 strikeouts. These numbers, while not Hall of Fame caliber, underscore a career marked by perseverance and adaptability.
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