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Wiki:

The origin of the use of "love" for zero is disputed. It is possible that it derives from the French expression for "the egg" (l'œuf) because an egg looks like the number zero ... similar to the origin of the term "duck" in cricket, supposedly from "duck's egg". One possibility comes from the Dutch expression iets voor lof doen, which means to do something for praise, implying no monetary stakes. Another theory ... at the start of any match, when scores are at zero, players still have "love for each other".