This was something special from Venus, because of the SUPPORT she received from the crowd in South Carolina, a state that has had many controversies concerning racism and the rebel flag that was flying over the Capitol only about three years ago.
Venus or Serena get little crowd support in other venues other than New York, and possibly Canada when they play in their home country. Most of the time even foreign players get more cheers than our own home grown champions. Consider Indian Wells or Scotsdale. Even Miami seems to give them only mild support. (They keep winning it anyway,,Ha..Ha)
Serena has never won in Charleston, but she had noticed this great support for her there and convinced Venus to join her this year.
Now Venus has experenced this herself. My bet is that both Venus and Serena will play here in the future whenever they are healthy.
Indian Wells, that note...You may have been replaced.