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Dominic Stephan Stricker, of Switzerland, returns a ball to Marin Cilic, of Croatia, during their first round match, during their first round match, at the ATP 250 Geneva Open tournament in Geneva, Switzerland, Tuesday, May 18, 2021. The matches of the Geneva Open are played in front of 100 spectators due to preventive measure against the spread the coronavirus COVID-19. (KEYSTONE/Salvatore Di Nolfi)