| Marthmallow vs King | 32–29 | 52.46% |
| Marthmallow vs Jin | 27–31 | 46.55% |
| Marthmallow vs Hwoarang | 28–22 | 56.00% |
| Marthmallow vs Lili | 23–22 | 51.11% |
| Marthmallow vs Reina | 26–18 | 59.09% |
| Marthmallow vs Steve | 25–18 | 58.14% |
| Marthmallow vs Paul | 17–20 | 45.95% |
| Marthmallow vs Law | 13–20 | 39.39% |
| Marthmallow vs Kazuya | 17–13 | 56.67% |
| Marthmallow vs Dragunov | 20–9 | 68.97% |
| Marthmallow vs Yoshimitsu | 16–11 | 59.26% |
| Marthmallow vs Bryan | 13–13 | 50.00% |
| Marthmallow vs Eddy | 10–15 | 40.00% |
| Marthmallow vs Alisa | 7–15 | 31.82% |
| Marthmallow vs Jun | 14–8 | 63.64% |
| Marthmallow vs Victor | 9–12 | 42.86% |
| Marthmallow vs Lars | 3–16 | 15.79% |
| Marthmallow vs Claudio | 8–10 | 44.44% |
| Marthmallow vs Lee | 10–8 | 55.56% |
| Marthmallow vs Azucena | 5–13 | 27.78% |
| Marthmallow vs Xiaoyu | 9–8 | 52.94% |
| Marthmallow vs Asuka | 8–8 | 50.00% |
| Marthmallow vs Devil Jin | 9–5 | 64.29% |
| Marthmallow vs Nina | 5–9 | 35.71% |
| Marthmallow vs Leo | 7–6 | 53.85% |
| Marthmallow vs Leroy | 9–4 | 69.23% |
| Marthmallow vs Jack-8 | 4–5 | 44.44% |
| Marthmallow vs Kuma | 3–5 | 37.50% |
| Marthmallow vs Raven | 3–5 | 37.50% |
| Marthmallow vs Feng | 2–4 | 33.33% |
| Marthmallow vs Zafina | 2–3 | 40.00% |
| Marthmallow vs Clive | 3–1 | 75.00% |
| Marthmallow vs Shaheen | 1–2 | 33.33% |
| Marthmallow vs Panda | 3–0 | 100.00% |
| Marthmallow vs Lidia | 0–2 | 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.