You won, and your rating went down. This is the single most common source of confusion about DUPR, and it isn’t a bug — it’s the system working as designed.
The short answer
DUPR doesn’t just record who won. It compares your actual result against an expected result.
Before a match, DUPR calculates an expected score from the combined ratings of both teams. Afterward it compares what actually happened to that prediction.
If you were expected to win 11-3 and you won 11-9, you won the match but underperformed the expectation — so your rating can fall. The reverse is also true: lose 11-9 to a much stronger team and your rating can rise, because you did better than predicted.
Why it’s built that way
A system that only counted wins and losses would be much easier to game and much less informative.
Under win-loss only, a strong player could farm easy matches against weak opponents and climb indefinitely. Because DUPR weighs the margin against expectation, beating a far weaker opponent narrowly tells the algorithm something real: you may not be as far ahead of them as your rating claims.
It also means your rating reflects how you actually played rather than who you happened to draw. That’s the whole point of a rating that calls itself dynamic.
The factors that move your rating
Five things determine which direction your rating goes and how far:
1. Expected vs actual score. The core mechanism described above.
2. Opponent rating. Beating higher-rated opponents produces a larger gain. Losing to lower-rated opponents produces a larger drop.
3. Match recency. Recent results carry more weight, so your rating tracks your current level rather than your history.
4. Match type. Club and tournament matches are weighted more heavily than casual recreational matches.
5. Reliability. A rating built on few matches moves more per result than one built on many. See DUPR reliability score.
Two related mechanics worth knowing: DUPR half-life governs how old results fade, and DUPR keeps separate singles and doubles ratings.
What to do about it
Nothing, mostly. A small drop after a narrow win is normal and not worth reacting to. Chasing a number rather than playing well is how people end up avoiding the matches that would actually improve them.
Play up. The most reliable way to raise a rating is to play opponents slightly stronger than you. The expectation is set low, so a close loss can gain you rating and a win gains a lot.
Play the whole match. If you’re up 10-2, finishing 11-2 rather than easing off to 11-7 is worth something. Not a reason to be unsportsmanlike, but worth knowing.
Record enough matches. A thin match history means volatile swings. More matches means a more stable, more accurate rating.
Don’t avoid strong opponents. Sandbagging — dodging tough matches to protect a number — produces a rating that’s both lower and less accurate than your real level, and it makes matchmaking worse for everyone.
The reverse case
Because the logic is symmetrical, your rating can go up after a loss. If you were expected to lose 11-2 and you lost 11-9, you outperformed the prediction, and DUPR will often reward that.
This is the part people like once they understand it. It means competitive losses against better players are not wasted, which removes the incentive to only play matches you’re confident of winning.
Frequently Asked Questions
Why did my DUPR go down after winning?
Because DUPR compares your actual score to an expected score based on both teams’ ratings. Winning by a smaller margin than predicted counts as underperforming, which can lower your rating.
Can your DUPR go up after a loss?
Yes. If you lose by a narrower margin than the algorithm expected — for instance a close loss to much stronger opponents — your rating can increase.
Does the score matter in DUPR, not just the win?
Yes. The margin relative to expectation is central to the calculation, which is why a narrow win over much weaker opponents can cost you rating.
How do I raise my DUPR rating?
Play opponents slightly stronger than you, since expectations are set lower and you gain more for good results. Record enough matches for stability, and play matches out rather than easing off with a big lead.
Why does my DUPR move so much after one match?
Probably a low reliability score from a thin match history. Ratings built on fewer matches move more per result until enough data accumulates.