Sunday's matchup between the Los Angeles Lakers and Minnesota Timberwolves averaged 7.35 million viewers on ABC.
The number, up 32% from last season, is the second most-watched first-round playoff game since 2002.
The game peaked at 10.27 million viewers.
Game 4 between the Knicks and Pistons averaged 3.9 million viewers.
The TNT matchups of Celtics-Magic averaged 3.78 million viewers, with the Bucks-Pacers averaging 2.74 million viewers.