MELBOURNE, AUSTRALIA - JANUARY 17: Stan Wawrinka of Switzerland practices ahead of the 2020 Australian Open at Melbourne Park on January 17, 2020 in Melbourne, Australia. (Photo by Mike Owen/Getty Images)
MELBOURNE, AUSTRALIA - JANUARY 17: Stan Wawrinka of Switzerland practices ahead of the 2020 Australian Open at Melbourne Park on January 17, 2020 in Melbourne, Australia. (Photo by Mike Owen/Getty Images)