There was a record for the world's longest recorded tennis match - Apparently.
The 2010 Wimbledon qualifying match between John Isner and Nicolas Mahut lasted 11 hours and 5 minutes, with Isner ultimately winning 6-4, 3-6, 6-7, 7-6, 70-68. The match was played over three days, with the players taking regular breaks to rest and rehydrate. This marathon match still holds the record for the longest ever played in tennis history, with a total of 183 games played.