| Cottonmouth vs Jin | 4–33 | 10.81% |
| Cottonmouth vs Reina | 9–26 | 25.71% |
| Cottonmouth vs Dragunov | 14–19 | 42.42% |
| Cottonmouth vs King | 9–16 | 36.00% |
| Cottonmouth vs Kazuya | 8–15 | 34.78% |
| Cottonmouth vs Leo | 10–11 | 47.62% |
| Cottonmouth vs Yoshimitsu | 6–14 | 30.00% |
| Cottonmouth vs Lili | 7–13 | 35.00% |
| Cottonmouth vs Bryan | 2–13 | 13.33% |
| Cottonmouth vs Steve | 4–10 | 28.57% |
| Cottonmouth vs Nina | 4–10 | 28.57% |
| Cottonmouth vs Asuka | 6–6 | 50.00% |
| Cottonmouth vs Devil Jin | 4–8 | 33.33% |
| Cottonmouth vs Lars | 5–7 | 41.67% |
| Cottonmouth vs Law | 6–5 | 54.55% |
| Cottonmouth vs Hwoarang | 5–6 | 45.45% |
| Cottonmouth vs Shaheen | 3–7 | 30.00% |
| Cottonmouth vs Zafina | 3–6 | 33.33% |
| Cottonmouth vs Paul | 6–2 | 75.00% |
| Cottonmouth vs Jack-8 | 5–3 | 62.50% |
| Cottonmouth vs Victor | 2–6 | 25.00% |
| Cottonmouth vs Xiaoyu | 4–3 | 57.14% |
| Cottonmouth vs Eddy | 2–5 | 28.57% |
| Cottonmouth vs Alisa | 5–1 | 83.33% |
| Cottonmouth vs Feng | 2–3 | 40.00% |
| Cottonmouth vs Lee | 2–3 | 40.00% |
| Cottonmouth vs Kuma | 2–3 | 40.00% |
| Cottonmouth vs Jun | 2–3 | 40.00% |
| Cottonmouth vs Leroy | 2–2 | 50.00% |
| Cottonmouth vs Azucena | 0–3 | 0.00% |
| Cottonmouth vs Claudio | 2–0 | 100.00% |
| Cottonmouth vs Panda | 0–2 | 0.00% |
| Cottonmouth vs Raven | 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.