| Mephistopheles vs Kazuya | 147–171 | 46.23% |
| Mephistopheles vs King | 155–140 | 52.54% |
| Mephistopheles vs Bryan | 152–142 | 51.70% |
| Mephistopheles vs Jin | 141–124 | 53.21% |
| Mephistopheles vs Heihachi | 143–116 | 55.21% |
| Mephistopheles vs Law | 120–119 | 50.21% |
| Mephistopheles vs Steve | 130–96 | 57.52% |
| Mephistopheles vs Reina | 92–123 | 42.79% |
| Mephistopheles vs Hwoarang | 98–103 | 48.76% |
| Mephistopheles vs Dragunov | 93–104 | 47.21% |
| Mephistopheles vs Azucena | 105–76 | 58.01% |
| Mephistopheles vs Lars | 82–92 | 47.13% |
| Mephistopheles vs Lee | 74–95 | 43.79% |
| Mephistopheles vs Lili | 85–81 | 51.20% |
| Mephistopheles vs Jun | 88–75 | 53.99% |
| Mephistopheles vs Clive | 82–72 | 53.25% |
| Mephistopheles vs Yoshimitsu | 77–69 | 52.74% |
| Mephistopheles vs Devil Jin | 81–62 | 56.64% |
| Mephistopheles vs Asuka | 78–64 | 54.93% |
| Mephistopheles vs Paul | 70–71 | 49.65% |
| Mephistopheles vs Victor | 79–53 | 59.85% |
| Mephistopheles vs Xiaoyu | 69–60 | 53.49% |
| Mephistopheles vs Leo | 69–55 | 55.65% |
| Mephistopheles vs Lidia | 59–53 | 52.68% |
| Mephistopheles vs Feng | 70–40 | 63.64% |
| Mephistopheles vs Eddy | 64–37 | 63.37% |
| Mephistopheles vs Fahkumram | 62–36 | 63.27% |
| Mephistopheles vs Armor King | 38–41 | 48.10% |
| Mephistopheles vs Nina | 36–39 | 48.00% |
| Mephistopheles vs Alisa | 34–37 | 47.89% |
| Mephistopheles vs Jack-8 | 38–31 | 55.07% |
| Mephistopheles vs Raven | 36–32 | 52.94% |
| Mephistopheles vs Claudio | 35–31 | 53.03% |
| Mephistopheles vs Kuma | 38–26 | 59.38% |
| Mephistopheles vs Leroy | 34–27 | 55.74% |
| Mephistopheles vs Miary Zo | 38–21 | 64.41% |
| Mephistopheles vs Zafina | 24–22 | 52.17% |
| Mephistopheles vs Anna | 24–22 | 52.17% |
| Mephistopheles vs Shaheen | 19–26 | 42.22% |
| Mephistopheles vs Panda | 8–11 | 42.11% |
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.