| nightmare vs King | 9–8 | 52.94% |
| nightmare vs Steve | 6–6 | 50.00% |
| nightmare vs Hwoarang | 8–3 | 72.73% |
| nightmare vs Jin | 5–6 | 45.45% |
| nightmare vs Lee | 10–1 | 90.91% |
| nightmare vs Asuka | 5–5 | 50.00% |
| nightmare vs Reina | 5–4 | 55.56% |
| nightmare vs Bryan | 7–1 | 87.50% |
| nightmare vs Leroy | 4–4 | 50.00% |
| nightmare vs Law | 2–5 | 28.57% |
| nightmare vs Yoshimitsu | 5–2 | 71.43% |
| nightmare vs Kazuya | 5–2 | 71.43% |
| nightmare vs Dragunov | 2–4 | 33.33% |
| nightmare vs Alisa | 5–1 | 83.33% |
| nightmare vs Devil Jin | 2–3 | 40.00% |
| nightmare vs Victor | 3–2 | 60.00% |
| nightmare vs Lidia | 3–2 | 60.00% |
| nightmare vs Lars | 2–2 | 50.00% |
| nightmare vs Azucena | 3–1 | 75.00% |
| nightmare vs Raven | 4–0 | 100.00% |
| nightmare vs Xiaoyu | 0–3 | 0.00% |
| nightmare vs Feng | 0–3 | 0.00% |
| nightmare vs Lili | 0–3 | 0.00% |
| nightmare vs Leo | 1–2 | 33.33% |
| nightmare vs Jun | 3–0 | 100.00% |
| nightmare vs Eddy | 3–0 | 100.00% |
| nightmare vs Heihachi | 1–2 | 33.33% |
| nightmare vs Nina | 1–1 | 50.00% |
| nightmare vs Panda | 2–0 | 100.00% |
| nightmare vs Claudio | 0–1 | 0.00% |
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.