Longest Tennis Match Ever Remains Undecided F C 15 years ago Longest Tennis Match Ever Remains Undecided Source: www.youtube.com The John Isner-Nicolas Mahut second round match at Wimbledon was suspended by darkness for the second straight day on Wednesday, making it the longest match in tennis history. (June 23) 10 hours – I don't think I could last 10 minutes! Share this: