Posted by Alex Bonilla on October 1, 2018
On Baseball-Reference, we include a statistic called WPA (Win Probability Added) in our boxscores. The basic definition of this statistic is the "sum of the differences in win expectancies for each play the player is credited with". You can find a deeper explanation on our Win Expectancy glossary page.
Given we're entering the 2018 postseason, we've decided to add postseason WPA calculations to player pages, postseason series summaries and postseason leaderboards. For an individual player, you will find this in the final column of the player's Postseason Batting and/or Postseason Pitching table. For example, here's a link to Mariano Rivera's table, breaking down his career 11.69 WPA in the postseason. If you go to our MLB Playoffs section, all series summaries will now include WPA in the series stats tables.
Our playoffs section also has career and single-season leaderboards which now have sections for WPA. The aforementioned Mariano Rivera leads all pitchers in career postseason WPA, while David Ortiz occupies the top of the career leaderboard for batting WPA in the postseason.
As a reminder, you can also find more detailed regular season win expectancy and win probability stats for players in their Advanced Stats pages, accessible from the Finders & Advanced Stats tab on player pages. If you have any questions or suggestions, feel free to contact us through our feedback form.