Tennis scoring uses the odd sequence of love, fifteen, thirty and forty rather than simple numbers.

The longer version

The counting likely began on a clock face, with each point advancing a hand a quarter turn, so fifteen, thirty and forty-five marked progress. Forty-five was later clipped to forty for ease of calling, and the uneven jump from thirty to forty reflects that shortening rather than any arithmetic. Love for zero is usually traced to a phrase about playing for nothing.

Deuce comes from a call meaning two more points are needed, which is why the advantage system exists at all: a player must lead by two, not one. That structure makes the score self-correcting and produces long games in which the server keeps losing the advantage. Similar clock-based counting survives in other racket sports, and this version has resisted simplification through centuries of reform.

Where this entry sits

Facts here look at the rules, equipment and odd histories behind familiar sports and games, from balls and rackets to cards, boards and playing fields. Expect small details about scoring quirks, stadium design and the long story of the Olympic Games. The full list sits on the Sports and Games page, where every entry is listed in order.