Jannik Sinner, Aryna Sabalenka, Novak Djokovic and more of the 20 highest-ranked players included their handwritten signatures.

Poland is hosting Switzerland and Ukraine in the round-robin qualifier, but Swiatek said Wednesday she made the "difficult decision" to skip it.

She’s just the fourth woman in the last decade to hit that number after Serena Williams, Ashleigh Barty and Iga Swiatek.