In which year was the "Battle of the Sexes" tennis match between Bobby Riggs and Billie Jean King?

In tennis, "Battle of the Sexes" is a term that has been used to describe various exhibition matches played between a man and a woman (or, in one case, a doubles match between two men and two women). Most famously, the term is used for a nationally televised match in 1973, held at the Houston Astrodome, between 55-year-old Bobby Riggs and 29-year-old Billie Jean King, which King won in three sets 6-4, 6-3, and 6-3.

The match attracted massive attention with over 30,000 spectators in attendance and was viewed by an estimated 90 million people around the world. King's win is considered a milestone in public acceptance of women's tennis.

King expressed relief at the end of the match, stating that she was worried losing it would have set women back. She also took home the $100,000 prize.