Barty's title at the All England Club in July was her second at a Grand Slam tournament. She also won the 2019 French Open and soon after moved up to No. 1 for the first time in June of that year.
Siniakova is coming off a title Wednesday at the season-ending WTA Finals in Guadalajara, Mexico, alongside doubles partner Barbora Krejcikova. Siniakova, a 25-year-old from the Czech Republic, ended 2018 as a co-No. 1 in doubles with Krejcikova.