Baseball Player Won-Lost Records

An overview of the website can be found here.

The basic calculation of Player won-lost records is described here. Player won-lost records are compared to WAR (as calculated by Baseball-Reference and Fangraphs) in an article here.

For a more in-depth description of Player won-lost records, how they are calculated, and who the best players of the past 80 years were in various aspects of Player won-lost records, I have published a book with McFarland, entitled Player Won-Lost Records in Baseball: Measuring Performance in Context.

I gave a presentation to the Chicago chapter of SABR (Society for American Baseball Research) on November 18, 2017. I have posted video of the presentation and follow-up Q-and-A on YouTube. The video runs almost exactly one hour.

Thank you for visiting the site and please come back often!


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note: Player Won-Lost records are estimated for all seasons from 1925 to 2017, and a handful of earlier seasons.

Data for 2017 are preliminary.

The information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at "www.retrosheet.org".
Baseball player won-lost records have been constructed by Tom Thress. Feel free to contact me by e-mail or follow me on Twitter.