From SABR member Jason Lukehart at Ground Ball With Eyes on August 14, 2013:
Earlier this year, I wrote about MLB being on-pace this season for a record number of extra inning games. That’s still true, though the pace has fallen from 272 to 254 (the record is 237). Yesterday (August 13) went a long way towards the quest to break that record, as there were 6 different games that went to extra innings. That’s not a record (quite), but it’s close. The record for most extra-inning games on the same day is 7, and that’s happened twice. Including those two days, there have been 6 or more extra-inning MLB games on the same day ten times*.
*I used Baseball-Reference’s Play Index (and hours and hours of scrolling through a list of more than 15,000 extra-inning games) to find these dates, and their data for that sort of thing dates back to 1916. It’s certainly possible that there were one or two other days with 6+ extra-inning games prior to 1916, though because there were just 16 teams back then, a day with so many extra-inning games was far less likely. In any event, this list technically covers only from 1916 on.
Read the full article here: http://groundballwitheyes.blogspot.com/2013/08/six-extra-inning-games-on-one-day.html
Originally published: August 14, 2013. Last Updated: August 14, 2013.