WTA Miami, USA Women Singles
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
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 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