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Longest Match in the history
Author : Arvin97
The match had taken 5h42min4s.
Visit the topic here : topic15-8080.php
Longest Rally in the history
Author : Tennischampion
The point had taken 289 rallies.
Visit the topic here : topic8-2843.php
Fastest Winner Speed
Author : Arvin97
The winner was a forehand smash with a speed of 234 km/h.
Fastest Service
Author : Arvin97
The service was a bug with a speed of 2298 km/h.
Visit the topic here : topic15-12394.php
I've served at 2314 km/h but I didn't took a picture
Highest Number of Games in a Match
Author : Arvin97
This record goes with the other world record "Longest Match in the history" where the score was 6/7(6) 7/6(4) 7/6(9) 6/7(5) 104/102 with a total of 258 games.
Visit the topic here : topic15-8080.php
!!! Please note that I don't know every category and if you want to add a new one, please tell me by Private Message with your record
Or you can simply post it on the subject 
, i read now the ''Most Games in a match'' so, i can't correct you, Good Luck 
Nice topic 
never saw such stuff in the game!