Set-based 2-margin games are not unheard of: take volleyball for example. As of the naming of the points (15, 30, 40), there ARE some theories around.And despite this little oddity, tennis has otherwise a logical and conventional scoring system..?
Reminds me a joke one my friends did.
it was the first point of a match we were watching in the crowd. It was the first time ever she even took care of tennis.
After the first point (15/0), she told me...
" Shit, i must have fallen asleep, i missed 14 points."