BBC Minute: On Naomi Osaka

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At just 20, Japanese tennis star Naomi Osaka is the US Open champion. She beat six-time champion Serena Williams, 16 years her elder, in New York on Saturday. The world number 19 has now beaten Serena twice, triumphing against her earlier this year in Miami. (Photo: Naomi Osaka poses with the championship trophy after winning the Women's Singles finals match against Serena Williams at the 2018 US Open in New York City, Credit: Julian Finney/Getty Images)