Svitolina has taken a wild card into the main draw at Charleston.
"We tried to get Novak Djokovic to be allowed to get an exemption, but that wasn't able to happen," Miami Open tournament director James Blake said.
The U.S. will bring a loaded squad to Delray Beach next month.
Tensions on the WTA Tour continue rising between some Ukrainian and Russian players.
Riding an 18-match winning streak, Daniil Medvedev shares a key to his focus.
Charging into his maiden Masters semifinal in Indian Wells reinforces Frances Tiafoe's major dream.
US Open champion cites one shot as major measuring stick.
