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Tennis player Marin Cilic (C) receives the title of Croatia's biggest sports promoter in the world from Croatian Olympic Committee in Zagreb, Croatia, on Dec. 20, 2017. (Xinhua/Davor Visnjic)

Tennis player Marin Cilic (C) receives the title of Croatia's biggest sports promoter in the world from Croatian Olympic Committee in Zagreb, Croatia, on Dec. 20, 2017. (Xinhua/Davor Visnjic)