What was Gauff referencing? Perhaps a notable accessory in the stands. Kostyuk’s husband Heorhii supported his spouse from her player box by sporting a baseball cap with a questionable phrase.

Kostyuk and her husband Heorhii were last seen in the Australian Open where the Ukrainian player and her husband were seen involved in some public display of affection following a weather delay.

"Until I was nine I thought [Novak] was going to be my husband," said Marta Kostyuk in Stuttgart on Tuesday.