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Roger Federer of Switzerland serves during the men's singles fourth round match against John Millman of Australia at the 2018 US Open in New York, the United States, Sept. 3, 2018. Millman won 3-1. (Xinhua/Wang Ying)
Roger Federer of Switzerland serves during the men's singles fourth round match against John Millman of Australia at the 2018 US Open in New York, the United States, Sept. 3, 2018. Millman won 3-1. (Xinhua/Wang Ying)