Rafael Nadal, left, of Spain walks past opponent Mackenzie McDonald of the U.S., during a break in their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Rafael Nadal of Spain plays a forehand return to Mackenzie McDonald of the U.S., during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan.18.
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Rafael Nadal of Spain reacts after winning a point against Mackenzie McDonald of the U.S. during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Mackenzie McDonald of the U.S., plays a forehand return to Rafael Nadal of Spain during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Rafael Nadal of Spain gestures during his second round match to Mackenzie McDonald of the U.S., at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Rafael Nadal of Spain reacts during his second round game against Mackenzie McDonald of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Rafael Nadal of Spain reacts during his second round match against Mackenzie McDonald of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Rafael Nadal, left, of Spain congratulates Mackenzie McDonald of the U.S., following their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Rafael Nadal, right, of Spain congratulates Mackenzie McDonald of the U.S., following their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Rafael Nadal of Spain waves as he leaves Rod Laver Arena following his second round loss to Mackenzie McDonald of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Coco Gauff, of the U.S. plays a forehand return to Emma Raducanu of Britain in their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Coco Gauff, left, of the U.S. is congratulated by Emma Raducanu of Britain following their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Shang Juncheng, left, of China congratulates Frances Tiafoe of the U.S. following their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Frances Tiafoe of the U.S. celebrates after defeating Shang Juncheng of China in their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Iga Swiatek, left, of Poland is congratulated by Camila Osorio of Colombia following their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.
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Iga Swiatek of Poland celebrates after defeating Camila Osorio of Colombia in their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 18.