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Stan Wawrinka of Switzerland serves to Damir Dzumhur of Bosnia and Herzegovina during their men's singles first round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 21, 2020. (Xinhua/Zhu Wei)
Stan Wawrinka of Switzerland serves to Damir Dzumhur of Bosnia and Herzegovina during their men's singles first round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 21, 2020. (Xinhua/Zhu Wei)