Continuing the theme of filling in the gaps in the FanGraphs Library, today we’re debuting a glossary entry explaining Base Running (BsR). We’ve had BsR on the site for a while, and you can find mention of it in the glossary amid the entries for wSB and UBR, but never on its own. Considering that BsR is featured on the main leaderboard page and serves as one of the building blocks of Wins Above Replacement (WAR), it earned a full entry.

It also became clear that some people were confusing it with BaseRuns, which is an entirely different thing, and we needed a place to make the distinction clear.

As always, feel free to post any questions you may have about the metric in the comments below. You can also get your FanGraphs and sabermetrics questions answered Wednesdays at 3pm, during our chat designed specifically for that purpose. Should you have any related questions, feel free to contact me on Twitter @NeilWeinberg44 as well.