Wednesday's game between the Indiana Fever and Las Vegas Aces averaged a 0.39 rating with 678,000 viewers on NBA TV.
The number represent the highest ever viewership for a WNBA game on NBA TV.
WNBA games have now set viewership records on NBA TV eight times this season, with all games involving Caitlin Clark.
Prior to this season, no WNBA game had averaged more than 210,000 viewers on NBA TV.