Photoshoots were the theme of this week, as the start of the 2019 season draws ever closer. 1 Stefanos Tsitsipas2 Dominika Cibulkova3 Naomi Osaka4 Aryna Sabalenka5 Angelique Kerber6 Serena WilliamsIn 2019, the ATP, WTA—and so much more—are on Tennis Channel Plus: