Serena withdraws, No. 1 Osaka loses, Federer wins at Miami
Serena Williams reacts as a ball hit by Rebecca Peterson, of Sweden, is out of bounds during the Miami Open tennis tournament, Friday, March 22, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Serena Williams reacts as a ball hit by Rebecca Peterson, of Sweden, is out of bounds during the Miami Open tennis tournament, Friday, March 22, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Mar. 22, 2019 06:44 PM EDT
Serena Williams reacts during her match against Rebecca Peterson, of Sweden, at the Miami Open tennis tournament, Friday, March 22, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Serena Williams reacts during her match against Rebecca Peterson, of Sweden, at the Miami Open tennis tournament, Friday, March 22, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Mar. 22, 2019 06:36 PM EDT
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
Roger Federer, of Switzerland, tosses the ball on a serve to Radu Albot, of Moldova, during the Miami Open tennis tournament Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Roger Federer, of Switzerland, tosses the ball on a serve to Radu Albot, of Moldova, during the Miami Open tennis tournament Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Mar. 23, 2019 06:59 PM EDT
Serena Williams returns to Rebecca Peterson, of Sweden, during the Miami Open tennis tournament, Friday, March 22, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Serena Williams returns to Rebecca Peterson, of Sweden, during the Miami Open tennis tournament, Friday, March 22, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Mar. 22, 2019 06:51 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
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
Roger Federer, of Switzerland, returns to Radu Albot, of Moldova, during the Miami Open tennis tournament, Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Roger Federer, of Switzerland, returns to Radu Albot, of Moldova, during the Miami Open tennis tournament, Saturday, March 23, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Mar. 23, 2019 06:58 PM EDT