Filip John (R) spikes the ball during the men's semifinals match between Argentina's Mauro Zelayeta/Bautista Amieva and Germany's Lukas Pfretzschner/Filip John at the FIVB Beach Volleyball U19 World Championships in Nanjing, capital of east China's Jiangsu Province, on July 14, 2018. Lukas Pfretzschner and Filip John won 2-1 and advanced to the finals. (Xinhua/Ji Chunpeng)