Novak Djokovic grimaces after winning the first set 6-4. Reuters
Novak Djokovic returns a shot against Karen Khachanov during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Karen Khachanov returns a shot against Novak Djokovic during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Novak Djokovic returns a shot against Karen Khachanov during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Novak Djokovic returns a shot against Karen Khachanov during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Karen Khachanov returns a shot against Novak Djokovic during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Tennis - Mubadala World Tennis Championship - Men Semi-Final - Abu Dhabi, United Arab Emirates - December 28, 2018. Russia's Karen Khachanov in action during his match against Serbia's Novak Djokovic. REUTERS/Suhaib Salem
Novak Djokovic drinks juice during an interval. Reuters
Novak Djokovic grimaces after winning the first set 6-4. Reuters
Novak Djokovic returns a shot against Karen Khachanov during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Karen Khachanov returns a shot against Novak Djokovic during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Novak Djokovic returns a shot against Karen Khachanov during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Novak Djokovic returns a shot against Karen Khachanov during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Karen Khachanov returns a shot against Novak Djokovic during their Mubadala World Tennis Championship match at Zayed Sports City. Reuters
Tennis - Mubadala World Tennis Championship - Men Semi-Final - Abu Dhabi, United Arab Emirates - December 28, 2018. Russia's Karen Khachanov in action during his match against Serbia's Novak Djokovic. REUTERS/Suhaib Salem
Novak Djokovic drinks juice during an interval. Reuters
Novak Djokovic grimaces after winning the first set 6-4. Reuters