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 have self-published a second book, which is available in either paperback or Kindle format at Amazon: Baseball Player Won-Lost Records: 150 Players, 50 Years. This book creates a list of the top 150 players of the first 50 years since MLB expansion (1961 - 2010) and examines these players through the prism of Player won-lost records.

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 1921 to 2018, 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 "".
Baseball player won-lost records have been constructed by Tom Thress. Feel free to contact me by e-mail, follow me on Twitter, and/or subscribe to my YouTube channel.