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One of the greats of women's athletics believes Britain's golden girl Jessica Ennis-Hill is on track to defend her Olympic Heptathlon title at the Rio Olympics. Carolina Klüft won Heptathlon gold at the Athens Olympics in 2004, and the Swede says Ennis-Hill is the woman to beat. (Image: Jessica Ennis-Hill celebrating Olympic Heptathlon gold at London 2012. Credit: Getty Images)