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Federer was the toughest opponent from the Big Three. He was...': Denis Istomin | Tennis News - Hindustan Times
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Denis Istomin defeated by Novak Djokovic at Dubai Duty Free Tennis Championships - AKIpress News Agency
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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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