WTA Miami, USA Women Singles
Naomi Osaka, of Japan, kneels on the court during her match against Hsieh Su-Wei, of Taiwan, during the Miami Open tennis tournament, Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Naomi Osaka, of Japan, kneels on the court during her match against Hsieh Su-Wei, of Taiwan, during the Miami Open tennis tournament, Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Mar. 23, 2019 05:37 PM EDT
Naomi Osaka, of Japan, talks with her coach Jermaine Jenkins during her match against Hsieh Su-Wei, of Tawain, at the Miami Open tennis tournament, Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Naomi Osaka, of Japan, talks with her coach Jermaine Jenkins during her match against Hsieh Su-Wei, of Tawain, at the Miami Open tennis tournament, Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Mar. 23, 2019 04:57 PM EDT
Hsieh Su-Wei, of Taiwan, returns to Naomi Osaka, of Japan, during the Miami Open tennis tournament, Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Hsieh Su-Wei, of Taiwan, returns to Naomi Osaka, of Japan, during the Miami Open tennis tournament, Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Mar. 23, 2019 04:15 PM EDT