What was the first Grand Slam tennis tournament to award equal prize money to men and women?
Answer: The U.S. Open (1973)
PBS - After Billie Jean King threatened to boycott the U.S. Open in 1973 over pay disparity, it became the first major tournament to award equal prize money to its male and female champions. Wimbledon, the oldest tennis tournament in the sport’s history, was the last Grand Slam event to follow suit in 2007, after Venus Williams led the charge for equal pay.
Today, thanks to the advocacy of King and other female players’, tennis is one of the few global sports that pays its men and women the same amount in major tournaments.