The longest match in history is NOT what is quoted above, but this match (sorry for the formatting) (quoted from Women's Tennis Blog:
The longest rally in tennis history: 29 minutes, 643 shots
Dave Seminara wrote a great story about an astonishing historic rally between two women's tennis players, and I will share some facts from his article here on Women's Tennis Blog.
Vicki Nelson and Jean Hepner played the longest rally in the history of professional tennis, which included 643 shots and was played when Hepner had a set point in the second set tiebreak, which lasted 1 hour and 47 minutes on its own. Can you believe it?
After the 29-minute long rally Nelson went for a winner and won the point. She was also the winner of the match, after 6 hours and 31 minutes of play. Final score was 6-4 7-6(11). Not surprisingly, the marathon was the longest match in tennis history for nearly twenty years, and is still the longest match completed on a single day.
When the rally was over, Nelson collapsed with cramps in her legs. Bizarrely, the chair umpire called a time-violation warning, but Nelson collected herself and continued the match.
You must be wondering how in the world that rally lasted so long. Nelson explains: "We were both pretty much standing on the baseline lobbing."
And imagine this: Had Hepner won the rally, the match would have been taken to the third set, and I don't want to even imagine where that would have led.
The match was played on September 24, 1984, in the first round of the $50,000 Virginia Slims-sponsored Ginny tournament at the Raintree Swim and Racquet Club in Richmond. Nelson and Hepner were ranked No. 93 and No. 172 in the world.