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Lorenzo Musetti, left, of Italy embraces Novak Djokovic of Serbia after retiring from their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Asanka Brendon Ratnayake
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Novak Djokovic, left, of Serbia gestures to Lorenzo Musetti of Italy after Musetti withdrew from there quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Aaron Favila
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Lorenzo Musetti of Italy waves as he leaves the court after withdrawing from his quarterfinal against Novak Djokovic of Serbia at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Aaron Favila
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Novak Djokovic of Serbia signs autographs after his quarterfinal match against Lorenzo Musetti of Italy at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Aaron Favila
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Lorenzo Musetti of Italy walks from the court after withdrawing from his quarterfinal against Novak Djokovic of Serbia at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
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Novak Djokovic of Serbia plays a forehand return to Lorenzo Musetti of Italy during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Asanka Brendon Ratnayake
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Lorenzo Musetti of Italy plays a backhand return to Novak Djokovic of Serbia during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
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Novak Djokovic of Serbia plays a backhand return to Lorenzo Musetti of Italy during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
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Lorenzo Musetti of Italy plays a backhand return to Novak Djokovic of Serbia during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
