The Montreal Expos season was the fifteenth in franchise history. At the end of the season, the Expos had managed the best cumulative winning percentage in the National League from 1979 to 1983.
April 27, 1983: Nolan Ryan of the Astros struck out Brad Mills to break Walter Johnson's all time mark for strikeouts in a career. Mills was the 3,509th strikeout of Ryan’s career.