John Isner of the United States reacts to a call by the umpire in his match against Nick Kyrgios of Australia at the Davis Cup World Group Quarterfinal in Brisbane, Australia, Friday, April 7, 2017. (AP/RSS Photo/Tertius Pickard)
John Isner of the United States reacts to a call by the umpire in his match against Nick Kyrgios of Australia at the Davis Cup World Group Quarterfinal in Brisbane, Australia, Friday, April 7, 2017. (AP/RSS Photo/Tertius Pickard)