On this day in history, Sept. 20, 1973, tennis star Billie Jean King wins 'Battle of the Sexes'

First lady Dr. Jill Biden and Billie Jean King join a celebration of the 50th anniversary of Title IX.

Trailblazing female tennis star Billie Jean King beat former men's champ, "boorish" Bobby Riggs, in a highly publicized match, the so-called "Battle of the Sexes," on this day in history, Sept. 20, 1973. 

The made-for-TV sports spectacle proved a watershed moment in the fight for women's equality in athletics. 

King won the tennis match in straight sets (6-4, 6-3, 6-3) in front of more than 30,000 spectators at the Houston Astrodome and millions more around the country and the world on television. 

"Not one day has passed that someone has not asked me about that match," King told Fox News Digital in an emailed comment this week. 

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"Fifty million people in the United States and an estimated 90 million people worldwide tuned in," King's website indicates about the match. 

It was "one of the most watched televised sporting events of all time" and "no tennis match before or since has been seen by so many."

Ahead of the ABC primetime broadcast, both athletes hammed it up for the cameras.

On Sept. 20, 1973, tennis star Billie Jean King is carried to the court by four men for the "Battle of the Sexes," a made-for-TV spectacle with 55-year-old tennis star Bobby Riggs. (Getty Images)

"King made a Cleopatra-style entrance on a gold litter carried by men dressed as ancient slaves," writes History.com, "while Riggs arrived in a rickshaw pulled by female models."

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Celebrated sportscaster Howard Cosell called the match, lending an air of