Tennis uses multiples of 15, but only up to 45, calls other points weird names, then closes a set, which has to be repeated at least 6 times for a separate scoring, with said scoring also needing to be repeated AT LEAST 3 more times, but can be dragged out ad infinitum.
Even table tennis has the decency of using a straight scoring system where 11 points wins a set and 2 sets wins the match.
Tennis doesn't even use numbers if they are tied!
Isn't it only when they're tied at 40, at which point it's deuce and then advantage to whichever side is at game point. Whenever they're tied anywhere else like 15-15, don't they say 15 all.
Disclaimer my knowledge of tennis is pretty much limited to Mario Tennis games and Wii Sports