PERTH, AUSTRALIA - JANUARY 05: John Isner of Team USA plays a forehand to Daniil Medvedev of Team Russia during day three of the 2020 ATP Cup Group Stage at RAC Arena on January 05, 2020 in Perth, Australia. (Photo by Paul Kane/Getty Images)
PERTH, AUSTRALIA - JANUARY 05: John Isner of Team USA plays a forehand to Daniil Medvedev of Team Russia during day three of the 2020 ATP Cup Group Stage at RAC Arena on January 05, 2020 in Perth, Australia. (Photo by Paul Kane/Getty Images)