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MELBOURNE, AUSTRALIA - JANUARY 28: Roger Federer (L) of Switzerland poses with the Norman Brookes Challenge Cup after winning the 2018 Australian Open Men's Singles Final against Marin Cilic of Croatia, posing with the runners-up trophy on day 14 of the 2018 Australian Open at Melbourne Park on January 28, 2018 in Melbourne, Australia. (Photo by Clive Brunskill/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 28:  Roger Federer (L) of Switzerland poses with the Norman Brookes Challenge Cup after winning the 2018 Australian Open Men's Singles Final against Marin Cilic of Croatia, posing with the runners-up trophy on day 14 of the 2018 Australian Open at Melbourne Park on January 28, 2018 in Melbourne, Australia.  (Photo by Clive Brunskill/Getty Images)