Untested so far at French Open, Djokovic faces Zverev next
(World News Russia)

Russia`s Karen Khachanov clenches his fist after scoring a point against Argentina`s Juan Martin del Potro during their fourth round match of the French Open tennis tournament at the Roland Garros stadium in Paris, Monday, June 3, 2019. (AP Photo/Michel Euler) Michel Euler Argentina`s Juan Martin del Potro plays a shot against Russia`s Karen Khachanov during their fourth round match of the French Open tennis tournament at the Roland Garros stadium in Paris, Monday, June 3, 2019. (AP Photo/Michel Euler) Michel Euler Serbia`s Novak Djokovic plays a shot against Germany`s Jan-Lennard Struff during their fourth round match of the French Open tennis tournament at the Roland Garros stadium in...