Tommy Paul crashed out of the BNP Paribas Open on Wednesday, March 13, but his girlfriend Paige Lorenze stayed positive despite the American's defeat.
POLG-related diseases disrupt the function of the mitochondria, or "powerhouses" of the cell — starving them of energy.
British men's number one Jack Draper faces Jenson Brooksby in the Indian Wells last 32 before fellow Brit Sonay Kartal takes on Polina Kudermetova. Top seed Aryna Sabalenka also competes.