John McEnroe has made his name as one of the greatest tennis players in recent history, but, unfortunately, he has also made another list: the list of lowest-rated television shows. In 2004, McEnroe launched his talk show, simply called McEnroe, on CNBC. The first week of the show raked in a measly 174,000 viewers, and it declined to reach under 40,000 viewers on at least one occasion. This earned the show a 0.0 rating by Nielsen Media Research. Needless to say, the talk show was canceled after just 22 episodes.