Friday night's Game 4 between the Minnesota Lynx and New York Liberty averaged a 0.9 rating with 1.67 million viewers on ESPN.
It was the most-watched WNBA Finals game in 24 years.
It was also the most-watched game in Lynx history.
The Liberty would beat the Lynx in Game 5 to win the WNBA Finals.
WNBA players also opted out of the current collective bargaining agreement on Monday.