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Serena Williams' five greatest tennis moments

A look at Serena Williams' greatest moments in tennis history, as the 23-time Grand Slam winner announces her retirement from the sport. The 40-year-old said she would retire after the US Open to be held from Aug 29 to Sept 11. WATCH MORE: https://thestartv.com/c/news SUBSCRIBE: https://cutt.ly/TheStar LIKE: https://fb.com/TheStarOnline
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