Game 1 of the Eastern Conference Finals between the Miami Heat and the Boston Celtics averaged a 3.2 rating with 5.95 million viewers on TNT.
The number represents a 5% decline in rating and a 2% decline in viewership from last season.
Viewership for all but two Heat playoff games have declined since last year.
Game 1 of the series between the Nuggets and Lakers averaged 7.36 million viewers.