The first live match I watched without anyone explaining it to me ended with a number I could not parse. The scoreboard read 7-6, and beneath the 6 sat a small superscript 3. I assumed it was a typo. It was not. That superscript was the tiebreak score, and the fact that I had no idea what it meant tells you most of what you need to know about why the tennis scoreboard frustrates newcomers.
Tennis sets are the middle layer of a scoring system that stacks four units on top of each other, and once you can see the stack, the quirks stop being quirks. This guide walks through that structure from the smallest unit up, so the next time a 7-6 appears with a tiny number underneath it, you will know exactly what happened.
What is a set in tennis, in one paragraph
A set is a collection of games, and a match is a collection of sets. To win a set, a player must win at least six games and lead by two — so 6-4 and 6-3 win the set, but 6-5 does not, because the lead is only one game. If the games reach 6-6, most formats settle the set with a tiebreak, a special game played to seven points. Win enough sets (two in most matches, three in the men's Grand Slams) and you win the match. Everything else is detail layered on that frame.
The four-layer stack
The cleanest way to read a tennis scoreboard is from the bottom up: point, game, set, match.
A point is the smallest unit, won on a single rally. A game is won by accumulating points. A set is won by accumulating games. A match is won by accumulating sets. The confusion almost always comes from the fact that each layer counts differently, and one of them counts in a sequence that looks like it was invented by someone who disliked round numbers.
How a game is won — the 15, 30, 40 problem
Within a game, points are not counted one, two, three. They are counted 15, 30, 40, and then game. The first point is 15, the second is 30, the third is 40, and the fourth wins — provided the opponent is on 30 or less. The leading historical explanation, repeated in most tennis histories, is that the numbers track a clock face, with points marking the quarter-hours; the 45 collapsed to 40 over time. We should be honest that this is the common story rather than a documented fact — the origin is not settled, and you will see it stated with more confidence than the evidence supports.
The wrinkle is deuce. If both players reach 40-40, the score is called deuce, and from there one player must win two points in a row to take the game. Win one and you have the advantage. Win the next and the game is yours. Lose it and the score returns to deuce. This is why a single game can stretch for several minutes, and why a player can win more total points in a set and still lose it.
How a set is won
Stack those games and you get a set. The first player to six games wins the set, but only if they lead by two. At 6-4 or 6-3 or 6-2, the set is over. At 6-5, it is not — play continues to 7-5, which ends it, or to 6-6, which does not.
The 6-6 deadlock is where the tiebreak enters. Introduced to professional tennis in the early 1970s to stop sets from running indefinitely, the tiebreak is a single deciding game played to seven points, win by two, counted as plain one-two-three rather than 15-30-40. The winner of the tiebreak takes the set 7-6. The superscript number that confused me — that 3 — was the loser's point total inside the tiebreak. A 7-6 with a tiny 3 means the tiebreak ended 7-3.
Three ways a set can end
There are three set formats you will encounter, and knowing which one is in play changes how you read a tight scoreline.
The tiebreak set is the standard. Six games, win by two, tiebreak at 6-6. Almost every set in professional tennis now uses it.
The advantage set has no tiebreak. At 6-6, play simply continues until one player leads by two games, which is why these can run to absurd lengths. The most famous example is the 2010 Wimbledon match between John Isner and Nicolas Mahut, whose final set reached 70-68 and whose total playing time exceeded 11 hours across three days. That match is a large part of why advantage sets have nearly vanished.
The final-set tiebreak, sometimes a longer 10-point version, is the compromise that replaced the advantage format at the Grand Slams. After years of each major running its own deciding-set rule, the four Grand Slams aligned in 2022 on a 10-point tiebreak at 6-6 in the final set. This is recent, and it is worth knowing that the rule you may have read about even a few years ago has since changed.
Why the format varies — and what it has to do with control
Format is not cosmetic. It shapes the kind of tennis you watch. A shorter, tiebreak-decided set rewards players who can produce a few decisive points under pressure — heavy spin to push an opponent off the baseline, then a flat ball into the open court. A longer advantage set rewards endurance and consistency, the player who can keep the ball deep and controlled for an extra hour without missing.
This is the quiet link between scoring and the spin-versus-control question that runs through the rest of the sport. When the format compresses a match into high-stakes tiebreaks, margin for error shrinks, and the premium on control rises. The scoreboard you are squinting at is, in a real sense, an argument about which style of play should be rewarded.
A quick reference for reading the scoreboard
| What you see | What it means |
|---|---|
| 6-4 | First player won the set, leading by two games |
| 6-5 | Set not over; lead is only one game |
| 7-5 | Set won after play continued past 6-5 |
| 7-6 (with small number) | Set won in a tiebreak; the small number is the loser's tiebreak points |
| 40-40 / deuce | Tied in a game; someone must win two straight points |
The honest rule of thumb: read the big numbers as games and the set as won at six-with-a-two-game-lead. When you see a 7-6, look for the superscript — that single small digit tells you the whole tiebreak story.
Back to the scoreboard
Once I understood the superscript, the match I had been half-following snapped into focus. The set had been even at 6-6, the tiebreak had gone 7-3, and the player I thought was losing had in fact just taken the set. Nothing about the rules had changed. Only my ability to read them had.
What is still genuinely unsettled is whether the recent move toward shorter, tiebreak-decided sets makes for better tennis or merely faster tennis. The Grand Slams standardized the final-set tiebreak only in 2022, and the sport has not yet had enough time to know what it gave up when it agreed, at last, to stop a great match from running forever.