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