DOSSIER – In this August 30, 2019 file photo, Kei Nishikori of Japan returns a photo of Alex de Minaur of Australia on the third circular of the US Open tennis championship in New York.Nishikori tested positive for COVID-19 on Sunday, August 16, 2020 and said he would retire from the Flushing Meadows concentrate tournament that begins next week (AP Photo / Eduardo Munoz Alvarez, archive)
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