The tie-break saved tennis from its own scoring

A scoring change introduced to protect television schedules turned out to protect the sport's competitive balance too.

Advantage sets have no upper bound. Six all, seven all, keep serving until someone breaks, and if nobody breaks you play until dark and come back tomorrow. For most of tennis history that was regarded not as a flaw but as the point: a set ended when one player was genuinely better, however long that took.

Then serves got faster and holding got easier and the arithmetic turned poisonous.

The tie-break, introduced at the start of the 1970s and resisted for years afterwards, was sold as a scheduling fix. Broadcasters could not sell an event whose matches had no maximum length. That framing did the change a disservice, because the deeper problem was competitive, not logistical. In a set where every service game is held, the two players are not really competing. They are waiting for one of them to have a bad four points, and the longer that goes on, the more the result is decided by fatigue and luck rather than by the difference between them.

A tie-break concentrates the decision. Both players serve, the mini-set is short, and the winner is the one who handles a specific pressure well. You can dislike it, and good players have, on the grounds that a lottery of seven points decides a set that took an hour. But an unbounded hold-fest is also a lottery. It is just a slower one, and it exhausts the player with less physical margin, which usually means the older or the smaller of the two.

The holdouts kept advantage final sets for decades, and the marathon matches that resulted became folklore precisely because they were absurd. A fifth set into the seventies of games is not a demonstration of quality. It is a demonstration that the scoring system has stopped functioning, with two exhausted men taking turns to serve because nobody wrote a stopping rule.

The final holdouts have gone now, more or less, and the sport is better for it, even though something did die. The old fifth set had a specific dread to it that a ten-point breaker does not reproduce.

Scoring systems are not neutral containers. They decide which qualities the sport rewards, and tennis spent a century rewarding the ability to keep serving after the tennis had stopped.