8 in men's singles by the Association of Tennis Professionals (ATP). Love How John Isner Fell in Love, Actually. 195.6k Followers, 444 Following, 110 Posts - See Instagram photos and videos from John Isner (@johnrisner) Featuring news, bio, rankings, playing activity, coach, stats, win-loss, points breakdown, videos, and more. Official tennis player profile of John Isner on the ATP Tour. He's the top-ranked U.S. men’s tennis player. But when he met Madison McKinley, it was game, set, match. John Robert Isner (born April 26, 1985) is an American professional tennis player who has been ranked as high as No.