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Denmark's Caroline Wozniacki (L-R), Canada's Milos Raonic, Switzerland's Roger Federer, Australia's Lleyton Hewitt, Serbia's Novak Djokovic and Belarus' Victoria Azarenka pose with characters from Teenage Mutant Ninja Turtles during Kids Tennis Day
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Switzerland's Roger Federer poses with a character from Teenage Mutant Ninja Turtles during Kids Tennis Day at Melbourne Park, Australia, January 16, 2016. The Australian Open tennis tournament starts January 18. REUTERS/Thomas
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