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Tennys Sandgren of the U.S. serves to Switzerland's Roger Federer during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 28, 2020. (AP Photo/Lee Jin-man Stock Photo -
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Switzerland's Roger Federer makes a backhand return to Tennys Sandgren of the U.S. during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 28, 2020. (AP Photo/Andy
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