Juan Martin del Potro of Argentina walks from the court after losing to Roberto Bautista Agut of Spain in their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014. (AP Photo/Andrew Brownbill)

Australian Open Tennis

Juan Martin del Potro of Argentina walks from the court after losing to Roberto Bautista Agut of Spain in their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014. (AP Photo/Andrew Brownbill)

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