A. Bartlett Giamatti (April 4, 1938 – September 1, 1989) was an individual known for his association with baseball. Giamatti was President of the National League from 1986 to 1989 and was the Commissioner of Major League Baseball in 1989 until his death from a heart attack in the same year.
In 2372, Benjamin Sisko replicated a baseball signed by Giamatti during the 1989 World Series. Sisko was among many in the 24th century who believed that Giamatti's death was the beginning of the end of professional baseball on Earth, due to his vision for the future of the game dying with him. (DS9 novel: The 34th Rule)