Naomi Osaka represents Japan. Although she has lived most of her life in the USA, Osaka was born in Japan to a Japanese mother and Haitian father. She moved to the USA when she was three years old and had dual American and Japanese citizenship. Naomi Osaka opted to represent Japan for the 2020 Olympics and to adhere to Japanese law, and she needed to relinquish her American citizenship before she reached the age of 22.