Game one of the Los Angeles Dodgers versus Chicago Cubs NLDS on Fox averaged a 3.9 overnight rating (on average 3.9% of the homes in the largest 56 markets were tuned-in). That’s the best Saturday overnight rating ever for FS1. Per Fox Sports the game averaged a 20.9 rating in Chicago, the highest rating ever for FS1 in the Chicago market.
Update: Per Fox Sports’ Michael Mulvihill the game averaged 5.9 million viewers. While that’s up from the last time the NLCS was on FS1 it was down from game 1 of last year’s Mets-Cubs NLDS (7.9 million on TBS on a Friday) and down from last year’s Cubs-Mets game 2 (6.6 million on TBS on a Saturday). TBS is available in 7.3 million more homes than FS1.