Stadium Court Six at Indian Wells will on Friday play host to two Ukrainian sisters, who escaped from Odessa when the bombs started falling.
The Yastremskas went first to Lyon, where Dayana finished runner-up in the singles, and Ivanna made her WTA debut alongside her sister in the doubles.
Now in California, the sisters are pairing up again to play Irina Camelia-Begu and Monica Niculescu of Romania.
"I would say we are more like friends," Dayana told BBC Sport.
Dayana is 21, but Ivanna is just 15. So the older sister has had to take on some parental responsibilities as well.