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The new tennis World number One Angelique Kerber of Germany poses with her silver medal of the Olympic Games in Brazil during a photo call after her arrival at the Franz-Josef-Strauss-airport in Munich, southern Germany, on September 13, 2016. The 28 year old Angelique Kerber won the US Open final in New York against Czech Karolina Pliskova on September 10, 2016. / AFP / CHRISTOF STACHE (Photo credit should read CHRISTOF STACHE/AFP via Getty Images)

The new tennis World number One Angelique Kerber of Germany poses with her silver medal of the Olympic Games in Brazil during a photo call after her arrival at the Franz-Josef-Strauss-airport in Munich, southern Germany, on September 13, 2016.
The 28 year old Angelique Kerber won the US Open final in New York against Czech Karolina Pliskova on September 10, 2016. / AFP / CHRISTOF STACHE        (Photo credit should read CHRISTOF STACHE/AFP via Getty Images)