To make a graph of the Win Expectancy of a baseball game, use the graph a game tool.
This data is from MLB games from 1957-2020, including postseason games. It omits games that are less than 9 innings (doubleheaders in 2020) as well as extra inning games where a runner starts on second base (non-playoff games in 2020). All data is available at Retrosheet.
Source files available on GitHub.
Articles written with this data:
The information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at 20 Sunset Rd., Newark, DE 19711.