US Open quarter-finalist gave up her American citizenship and refused to represent the USA

One of the US Open's biggest stars gave up her American citizenship in 2019.Nationality is a big deal in tennis, with players representing their home countries at every tournament including the US Open. Some also fly their flags at international events like the Davis Cup and the women's equivalent named after Billie Jean King. However, some players have chosen to renounce their nationalities and play under the banner of other countries. Earlier this year, Daria Kasatkina switched her sporting allegiance from Russia to Australia. She had been an outspoken critic of the war in Ukraine and the anti-LGBTQ+ laws in...