PREVIEW

(200120) -- MELBOURNE, Jan. 20, 2020 (Xinhua) -- Cori Gauff (L) of the United States takes photos with Venus Williams of the United States before the first round of women's singles match between Cori Gauff of the United States and Venus Williams of the United States at 2020 Australian Open in Melbourne, Australia, Jan. 20, 2020. (Xinhua/Wang Jingqiang)