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A supporter of Switzerland's Roger Federer displays a banner during his men's singles match against Steve Johnson of the US on day one of the Australian Open tennis tournament in Melbourne on January 20, 2020. - IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE (Photo by William WEST / AFP) / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE (Photo by WILLIAM WEST/AFP via Getty Images)

A supporter of Switzerland's Roger Federer displays a banner during his men's singles match against Steve Johnson of the US on day one of the Australian Open tennis tournament in Melbourne on January 20, 2020. - IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE (Photo by William WEST / AFP) / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE (Photo by WILLIAM WEST/AFP via Getty Images)