On this day, July 25, 1970, the United States Tennis Association (USTA) officially announced one of the biggest changes in tennis rules: the introduction of a sudden-death nine-point tiebreak at the US Open, still very different from the tiebreak as we know it today. This new addition was not welcomed by the players but loved by the crowds as well as television broadcasters, who could now predict… Source
July 25, 1970: The day the USTA announced the introduction of the tiebreak
