| Joseph Mama vs Eddy | 39–39 | 50.00% |
| Joseph Mama vs King | 25–39 | 39.06% |
| Joseph Mama vs Jin | 32–24 | 57.14% |
| Joseph Mama vs Steve | 28–27 | 50.91% |
| Joseph Mama vs Hwoarang | 25–22 | 53.19% |
| Joseph Mama vs Kazuya | 18–27 | 40.00% |
| Joseph Mama vs Bryan | 18–21 | 46.15% |
| Joseph Mama vs Yoshimitsu | 22–16 | 57.89% |
| Joseph Mama vs Lili | 22–16 | 57.89% |
| Joseph Mama vs Reina | 22–13 | 62.86% |
| Joseph Mama vs Dragunov | 14–20 | 41.18% |
| Joseph Mama vs Law | 16–16 | 50.00% |
| Joseph Mama vs Lee | 17–15 | 53.12% |
| Joseph Mama vs Jun | 12–17 | 41.38% |
| Joseph Mama vs Victor | 10–17 | 37.04% |
| Joseph Mama vs Paul | 11–15 | 42.31% |
| Joseph Mama vs Azucena | 18–8 | 69.23% |
| Joseph Mama vs Lars | 12–13 | 48.00% |
| Joseph Mama vs Xiaoyu | 8–13 | 38.10% |
| Joseph Mama vs Asuka | 17–4 | 80.95% |
| Joseph Mama vs Jack-8 | 9–8 | 52.94% |
| Joseph Mama vs Devil Jin | 7–9 | 43.75% |
| Joseph Mama vs Alisa | 8–4 | 66.67% |
| Joseph Mama vs Kuma | 6–6 | 50.00% |
| Joseph Mama vs Claudio | 3–8 | 27.27% |
| Joseph Mama vs Leo | 5–5 | 50.00% |
| Joseph Mama vs Feng | 0–8 | 0.00% |
| Joseph Mama vs Nina | 4–3 | 57.14% |
| Joseph Mama vs Zafina | 5–2 | 71.43% |
| Joseph Mama vs Panda | 4–2 | 66.67% |
| Joseph Mama vs Shaheen | 3–2 | 60.00% |
| Joseph Mama vs Raven | 2–3 | 40.00% |
| Joseph Mama vs Leroy | 2–2 | 50.00% |
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.