What did Sabalenka say to her fitness trainer Jason Stacey?

Tennis players are considered creatures of habit. Eating the same food before a match,

For example, former world No. 1 Justine Henin was famous for the fact that she never walked over the line when she came to the court and was in the middle of a point.

Reigning Australian Open champion Aryna Sabalenka is taking the definition to a new extreme in Melbourne this year – and she's making it a team effort.

Before each match of his title defense so far, the No. 2 seed has written his signature on the bald head of his fitness trainer Jason Stacy.

Sabalenka said this to thunderous laughter at the Margaret Court Arena after her 6-3, 6-2 fourth-round win over American Amanda Anisimova on Sunday.

She revealed that she had done this without thinking the first time before her 6-0, 6-1 win against German qualifier Ella Seidel in the opening round.