Greg Maddux went 6-14 as a rookie in 1987, but began his amazing run in 1988 by going 18-8 at age 22 and making his first NL All-Star team.
A 22-year-old Greg Maddux of the Chicago Cubs pitches during a game against the New York Mets in the 1988 season at Wrigley Field in Chicago.
Jonathan Daniel/Getty Images