| Mayday vs King | 43–42 | 50.59% |
| Mayday vs Clive | 35–49 | 41.67% |
| Mayday vs Jin | 39–39 | 50.00% |
| Mayday vs Kazuya | 28–33 | 45.90% |
| Mayday vs Reina | 19–32 | 37.25% |
| Mayday vs Law | 20–19 | 51.28% |
| Mayday vs Bryan | 19–18 | 51.35% |
| Mayday vs Heihachi | 18–18 | 50.00% |
| Mayday vs Asuka | 14–18 | 43.75% |
| Mayday vs Yoshimitsu | 11–20 | 35.48% |
| Mayday vs Lili | 17–12 | 58.62% |
| Mayday vs Hwoarang | 14–14 | 50.00% |
| Mayday vs Xiaoyu | 14–13 | 51.85% |
| Mayday vs Steve | 13–12 | 52.00% |
| Mayday vs Jun | 11–14 | 44.00% |
| Mayday vs Paul | 9–15 | 37.50% |
| Mayday vs Azucena | 9–14 | 39.13% |
| Mayday vs Nina | 7–15 | 31.82% |
| Mayday vs Victor | 10–11 | 47.62% |
| Mayday vs Lee | 8–12 | 40.00% |
| Mayday vs Feng | 6–13 | 31.58% |
| Mayday vs Lidia | 10–9 | 52.63% |
| Mayday vs Dragunov | 8–10 | 44.44% |
| Mayday vs Alisa | 5–12 | 29.41% |
| Mayday vs Kuma | 3–13 | 18.75% |
| Mayday vs Eddy | 6–9 | 40.00% |
| Mayday vs Lars | 10–4 | 71.43% |
| Mayday vs Jack-8 | 5–7 | 41.67% |
| Mayday vs Leo | 7–4 | 63.64% |
| Mayday vs Raven | 5–5 | 50.00% |
| Mayday vs Claudio | 5–4 | 55.56% |
| Mayday vs Leroy | 3–3 | 50.00% |
| Mayday vs Devil Jin | 2–2 | 50.00% |
| Mayday vs Zafina | 0–3 | 0.00% |
| Mayday vs Shaheen | 1–0 | 100.00% |
| Mayday vs Panda | 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.