Question

Who was the capacity crowd's sustained loud applause for, when Croatian-Australian Ajla Tomljanović won in the third round of the Women's Singles of the 2022 US Open?

Answer 1

Her opponent
The opponent against whom Tomljanovic had won was Serena Williams in what was said to be the last match of her star-studded tennis career before she moved on towards other interests. It was estimated that Arthur Ashe Stadium held about 24,000 Williams fans.