Naomi Osaka

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Kei Nishikori, of Japan, celebrates after defeating Marin Cilic, of Croatia, during the quarterfinals of the U.S. Open tennis tournament, Wednesday, Sept. 5, 2018, in New York. (AP Photo/Adam Hunger)

Nishikori, Osaka give Japan historic tennis day at US Open

By BRIAN MAHONEY - Associated Press

Serena Williams returns to Naomi Osaka, of Japan, during the Miami Open tennis tournament, Wednesday, March 21, 2018, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

Serena Williams loses in 1st round at Miami Open to Osaka

By Steven Wine - Associated Press

Naomi Osaka, of Japan, serves to Daria Kasatkina, of Russia, in the women's final at the BNP Paribas Open tennis tournament, Sunday, March 18, 2018, in Indian Wells, Calif. Osaka won 6-3, 6-2. (AP Photo/Mark J. Terrill)

Serena to face rising star Osaka in 1st round at Miami Open

By STEVEN WINE - Associated Press

Naomi Osaka, of Japan, poses with her trophy after defeating Daria Kasatkina, of Russia, in the women's final at the BNP Paribas Open tennis tournament, Sunday, March 18, 2018, in Indian Wells, Calif. Osaka won 6-3, 6-2. (AP Photo/Mark J. Terrill)

Naomi Osaka on her way up with first pro tennis title

By BETH HARRIS - Associated Press

RETRANSMISSION TO PLAYER TO NAOMI OSAKA - Angelique Kerber, of Germany, reacts after losing a point to Naomi Osaka of Japan, during the first round of the U.S. Open tennis tournament, Tuesday, Aug. 29, 2017, in New York. (AP Photo/Frank Franklin II)

Angelique Kerber out in 1st round at U.S. Open

By Brian Mahoney - Associated Press

Caroline Wozniacki, of Denmark, returns a shot against Belinda Bencic, of Switzerland, during the women's singles match at the Pan Pacific Open women's tennis tournament in Tokyo, Tuesday, Sept. 20, 2016. (AP Photo/Eugene Hoshiko)

Wozniacki beats Japanese teen Osaka to win Pan Pacific Open

By JIM ARMSTRONG - Associated Press