The Red Sox clinching Game 4 victory over the Yankees was the most-watched program on cable Tuesday night and the most-watched Division Series game on TBS since 2007, the network said.
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The game had an average viewership of 7.1 million and peaked at 8.5 million from 11:15 to 11:30 p.m. In Boston, the Game 4 telecast did a 23.9 rating, the highest-rated LDS game on any network in the market since 2008.
Nationally, viewership for TBS baseball postseason coverage is up 40 percent over 2016 - the last time the network had the ALDS - and 13 percent over last year's NLDS, which included a decisive Cubs-Nationals Game 5.
The NFL still has a significant edge over postseason baseball nationally. Red Sox-Yankees Game 3 on Monday night drew a 3.4 rating nationally for TBS but was outdone by the Saints-Redskins "Monday Night Football" telecast on ESPN at 7.3. The Red Sox and Patriots will go head to head for ratings Sunday night when the Sox host Game 2 of the ALCS against the Astros on TBS just after 7 p.m. before the Patriots host the Chiefs on NBC's "Sunday Night Football" at 8:20.