Q. Why you should never fall in love with a tennis player?
A. To them ‘Love’ means nothing.

The origin of the use of “love” for zero is also disputed; it is possible that it derives from the French word for an egg (l‘oeuf) because an egg looks like the number zero. “Love” is also said to possibly derive from “l’heure” or “the hour” in French. When stating the score, the server’s score is stated first. If the server (or the umpire) announces the score as “thirty-love,” for example, it means that the server has won two points and the receiver none.
Taken from Wikipedia

Maybe I should stop playing tennis…
:-(