Duncan was signed by the Los Angeles Dodgers as an undrafted free agent on January 7, 1982. He played in the Dodgers minor league system for three seasons with the Lethbridge Dodgers in 1982, Vero Beach Dodgers in 1983 and San Antonio Dodgers in 1984. He stole 56 bases for Vero Beach and 41 bases for San Antonio, and at San Antonio he tied Stu Pederson for the league lead in triples. He made his major league debut, starting at second base, for the Dodgers on April 9, 1985 against the Houston Astros, and was 0 for 4 in his debut. He got his first major league hit on April 10 against Astros pitcher Joe Niekro.\n', '

He stole 38 bases in his rookie season and finished third in the rookie of the year voting.\n', '

Duncan was traded by the Dodgers to the Cincinnati Reds with Tim Leary on July 18, 1989 for Lenny Harris and Kal Daniels.\n', '

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