John Robert Isner (born April 26, 1985) is an American professional tennis player. He achieved his career-high singles ranking of World No. 9 on March 19, 2012, and is currently the highest-ranked male American tennis player. His most famous victories were against Roger Federer in the Davis Cup encounter in February 2012, top seed Novak Djokovic at the 2012 Masters 1000 tournament in Indian Wells, Andy Roddick in the 2009 US Open, and against Nicolas Mahut at the 2010 Wimbledon Championships where he played the longest ever professional tennis match, which lasted 11 hours and 5 minutes over the course of three days. He also played in the 10th-longest match ever—a 5 hour 41 minute match in the second round of the 2012 French Open.