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Switzerland's Tobias Kuenzi, front, and Oliver Schaller, back, return a shuttlecock to Indonesia's M.R. Arjun and Ramchandran Shlok during their men's doubles first round match at the BWF Badminton World Championships in the St. Jakobshalle in Basel, Switzerland, on Tuesday, August 20, 2019. (KEYSTONE/Georgios Kefalas)