Stefanos Tsitsipas (L) shakes hands with Roberto Bautista Agut after the men's singles quarterfinal match between Roberto Bautista Agut of Spain and Stefanos Tsitsipas of Greece at at 2019 Australian Open in Melbourne, Australia, on Jan. 22, 2019. Stefanos Tsitsipas won 3-1. (Xinhua/Bai Xuefei)