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