Naomi Osaka defeated Petra Kvitová in the final, 7–6(7–2), 5–7, 6–4 to win the women's singles tennis title at the 2019 Australian Open. It was her first Australian Open title and second major title overall. With the win, Osaka became the world No. 1, and the first player since Jennifer Capriati to win their first two major titles at consecutive events. Eleven players were in contention for the world No. 1 ranking: Kvitová, Osaka, reigning world No. 1 Simona Halep, reigning champion Caroline Wozniacki, Sloane Stephens, Karolína Plíšková, Angelique Kerber, Elina Svitolina, Kiki Bertens, Aryna Sabalenka and Daria Kasatkina.