| nightmare vs King | 86–73 | 54.09% |
| nightmare vs Jin | 77–65 | 54.23% |
| nightmare vs Bryan | 58–79 | 42.34% |
| nightmare vs Law | 86–44 | 66.15% |
| nightmare vs Kazuya | 63–59 | 51.64% |
| nightmare vs Paul | 59–60 | 49.58% |
| nightmare vs Dragunov | 35–57 | 38.04% |
| nightmare vs Reina | 40–49 | 44.94% |
| nightmare vs Devil Jin | 39–37 | 51.32% |
| nightmare vs Heihachi | 30–39 | 43.48% |
| nightmare vs Hwoarang | 39–28 | 58.21% |
| nightmare vs Yoshimitsu | 30–36 | 45.45% |
| nightmare vs Eddy | 24–28 | 46.15% |
| nightmare vs Steve | 33–16 | 67.35% |
| nightmare vs Victor | 21–18 | 53.85% |
| nightmare vs Nina | 22–16 | 57.89% |
| nightmare vs Jun | 15–18 | 45.45% |
| nightmare vs Feng | 12–19 | 38.71% |
| nightmare vs Asuka | 17–13 | 56.67% |
| nightmare vs Alisa | 10–18 | 35.71% |
| nightmare vs Lee | 21–7 | 75.00% |
| nightmare vs Azucena | 12–14 | 46.15% |
| nightmare vs Lili | 11–12 | 47.83% |
| nightmare vs Lars | 9–14 | 39.13% |
| nightmare vs Leroy | 8–15 | 34.78% |
| nightmare vs Shaheen | 11–8 | 57.89% |
| nightmare vs Clive | 6–11 | 35.29% |
| nightmare vs Xiaoyu | 4–11 | 26.67% |
| nightmare vs Kuma | 5–8 | 38.46% |
| nightmare vs Claudio | 7–5 | 58.33% |
| nightmare vs Leo | 6–5 | 54.55% |
| nightmare vs Lidia | 4–4 | 50.00% |
| nightmare vs Zafina | 3–4 | 42.86% |
| nightmare vs Raven | 4–1 | 80.00% |
| nightmare vs Jack-8 | 1–2 | 33.33% |
| nightmare vs Panda | 2–1 | 66.67% |
Limitations
This data is often requested to give insight into which characters you have more trouble with than others, but it is not particularly helpful for that. The main issue is that it is heavily skewed by how strong the opponents you play are.
For example, this data suggests my worst matchup is clearly vs Reina, but that's just because most of those games are vs Yagami.
There is a way to account for this being worked on. The central idea is to assign each matchup a rating vs you which adjusts based on the result, much like the regular rating but also based on the rating of each player. With this, it would give a better summary of how well you perform vs each character.
In the meantime, this page is here to present the data as requested.