Why did the tennis player refuse to get married?

This joke serves up a playful ace of wordplay, hinging entirely on the double meaning of "love." In the realm of romance and matrimony, "love" signifies deep affection, commitment, and everything you'd expect a potential spouse to feel. The punchline cleverly misleads us, implying emotional coldness or a lack of care for genuine affection.

However, the humor really lands when you understand the unique scoring system of tennis. In this sport, "love" is simply the term for a score of zero. So, when a tennis player declares that "love means nothing to him," they're not being a heartless cad; they're merely stating a fundamental rule of the game. A score of zero literally contributes nothing to winning the match. This peculiar usage dates back to the late 1800s, with one popular theory suggesting it comes from the French word "l'oeuf" (egg), due to an egg's resemblance to the number zero, or from the expression "to play for love," meaning playing for the enjoyment of the game rather than for stakes.

The joke’s charm lies in this delightful clash of contexts. It takes a word loaded with emotional weight in one scenario and twists it to its purely numerical, and therefore "meaningless," definition in another. It's a clever linguistic volley that scores big laughs for those in the know about both matters of the heart and the rules of the court.