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MELBOURNE, AUSTRALIA - JANUARY 26: Roger Federer of Switzerland plays a forehand in his semi-final match against Hyeon Chung of South Korea on day 12 of the 2018 Australian Open at Melbourne Park on January 26, 2018 in Melbourne, Australia. (Photo by Mark Kolbe/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26: Roger Federer of Switzerland plays a forehand in his semi-final match against Hyeon Chung of South Korea on day 12 of the 2018 Australian Open at Melbourne Park on January 26, 2018 in Melbourne, Australia. (Photo by Mark Kolbe/Getty Images)
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