Nick Kyrgios is well-known for creating shock headlines in the world of tennis, but his last-minute withdrawal of the inaugural United Cup, seemed to surprise even his teammates.The United Cup is a new event, taking place over three Australian cities, Brisbane, Perth and Sydney. The tournament, which runs from Dec. 29- to Jan. 8, features 18 countries split into six groups of three, with teams playing two men’s and two women’s singles matches and a mixed doubles match.Kyrgios was set to lead the Australian men’s team in the joint ATP and WTA event, but just minutes before the team press-conference, news spread of his withdrawal. Co-captain Sam Stosur was left to tr …