| Mephistopheles vs Law | 15–17 | 46.88% |
| Mephistopheles vs Bryan | 14–16 | 46.67% |
| Mephistopheles vs King | 7–18 | 28.00% |
| Mephistopheles vs Jin | 12–8 | 60.00% |
| Mephistopheles vs Steve | 11–9 | 55.00% |
| Mephistopheles vs Kazuya | 7–12 | 36.84% |
| Mephistopheles vs Yoshimitsu | 12–4 | 75.00% |
| Mephistopheles vs Victor | 7–9 | 43.75% |
| Mephistopheles vs Paul | 7–8 | 46.67% |
| Mephistopheles vs Reina | 6–8 | 42.86% |
| Mephistopheles vs Leo | 5–8 | 38.46% |
| Mephistopheles vs Dragunov | 6–5 | 54.55% |
| Mephistopheles vs Hwoarang | 2–7 | 22.22% |
| Mephistopheles vs Asuka | 3–6 | 33.33% |
| Mephistopheles vs Lili | 7–2 | 77.78% |
| Mephistopheles vs Lars | 7–2 | 77.78% |
| Mephistopheles vs Fahkumram | 6–3 | 66.67% |
| Mephistopheles vs Feng | 2–6 | 25.00% |
| Mephistopheles vs Azucena | 5–3 | 62.50% |
| Mephistopheles vs Leroy | 4–3 | 57.14% |
| Mephistopheles vs Eddy | 3–4 | 42.86% |
| Mephistopheles vs Jack-8 | 3–3 | 50.00% |
| Mephistopheles vs Kuma | 4–2 | 66.67% |
| Mephistopheles vs Raven | 5–1 | 83.33% |
| Mephistopheles vs Lidia | 3–3 | 50.00% |
| Mephistopheles vs Heihachi | 2–4 | 33.33% |
| Mephistopheles vs Clive | 3–3 | 50.00% |
| Mephistopheles vs Devil Jin | 1–4 | 20.00% |
| Mephistopheles vs Zafina | 4–1 | 80.00% |
| Mephistopheles vs Jun | 2–3 | 40.00% |
| Mephistopheles vs Claudio | 1–3 | 25.00% |
| Mephistopheles vs Xiaoyu | 1–2 | 33.33% |
| Mephistopheles vs Alisa | 1–2 | 33.33% |
| Mephistopheles vs Lee | 3–0 | 100.00% |
| Mephistopheles vs Nina | 0–2 | 0.00% |
| Mephistopheles vs Shaheen | 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.