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Novak Djokovic salutes good friend Viktor Troicki on his retirement, calls him an "important part of his tennis story"
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Viktor Troicki at the ATP Tennis in Doha Editorial Stock Image - Image of troicki, athlete: 17726364
ATP Tour - Viktor Troicki secures his spot opposite Rafa Nadal in MercedesCup final. Can Viktor pull the upset? Read report: http://bit.ly/1SdmtUl | Facebook
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