Grigor Dimitrov of Bulgaria strides over a signboard for a shot as he plays Roberto Bautista Agut of Spain during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aijaz Rahi)

APTOPIX Australian Open Tennis

Grigor Dimitrov of Bulgaria strides over a signboard for a shot as he plays Roberto Bautista Agut of Spain during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aijaz Rahi)

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