Contents John Isner BioJohn Isner's Relationship StatusJohn Isner's Wife Madison McKinleyJohn Isner ChildrenJohn Isner Bio John Robert Isner is an American tennis player who was born on the 26th of April 1985 in North Carolina, US. He started playing tennis when he was 11 and become a professional tennis player 11 years later. In his career, he has won 10 singles titles and 4 doubles titles so