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Davis Cup: Prajnesh Gunneswaran planning a Menace for Denis Istomin | Sports News,The Indian Express
Australian Open tennis 2019: Roger Federer v Denis Istomin first round, 2017 win over Novak Djokovic | Herald Sun
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Denis Istomin, the star coached by his mum, told he would never play tennis again following horrific car crash... and famous conqueror of Novak Djokovic at the Australian Open 2017 | The Sun
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