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Who is Denis Istomin? Roger Federer's first round opponent at French Open 2021 who knocked Novak Djokovic out of Australian Open
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Denis Istomin: Call me a mummy's boy if you want.. but she can help me beat Andy Murray - Daily Record
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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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2017 AO Asia-Pacific Wildcard Play-off: Denis Istomin wins the title and the place in the Australian Open main draw
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