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Steve Johnson of the United States hits a return to Roger Federer of Switzerland during their men's singles first round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 20, 2020. (Xinhua/Zhu Wei)

Steve Johnson of the United States hits a return to Roger Federer of Switzerland during their men's singles first round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 20, 2020. (Xinhua/Zhu Wei)