| Efecakann vs Jin | 36–33 | 52.17% |
| Efecakann vs Reina | 31–28 | 52.54% |
| Efecakann vs Eddy | 22–33 | 40.00% |
| Efecakann vs Hwoarang | 21–22 | 48.84% |
| Efecakann vs Paul | 14–27 | 34.15% |
| Efecakann vs Kazuya | 20–20 | 50.00% |
| Efecakann vs Dragunov | 17–23 | 42.50% |
| Efecakann vs Law | 22–16 | 57.89% |
| Efecakann vs King | 17–19 | 47.22% |
| Efecakann vs Bryan | 14–15 | 48.28% |
| Efecakann vs Steve | 13–15 | 46.43% |
| Efecakann vs Yoshimitsu | 8–15 | 34.78% |
| Efecakann vs Xiaoyu | 8–13 | 38.10% |
| Efecakann vs Devil Jin | 8–13 | 38.10% |
| Efecakann vs Azucena | 9–11 | 45.00% |
| Efecakann vs Lili | 8–9 | 47.06% |
| Efecakann vs Lee | 11–6 | 64.71% |
| Efecakann vs Jun | 10–6 | 62.50% |
| Efecakann vs Victor | 8–8 | 50.00% |
| Efecakann vs Raven | 9–5 | 64.29% |
| Efecakann vs Asuka | 10–3 | 76.92% |
| Efecakann vs Kuma | 8–5 | 61.54% |
| Efecakann vs Alisa | 6–6 | 50.00% |
| Efecakann vs Lars | 4–7 | 36.36% |
| Efecakann vs Feng | 8–2 | 80.00% |
| Efecakann vs Claudio | 4–5 | 44.44% |
| Efecakann vs Nina | 7–2 | 77.78% |
| Efecakann vs Zafina | 6–3 | 66.67% |
| Efecakann vs Jack-8 | 5–1 | 83.33% |
| Efecakann vs Shaheen | 2–4 | 33.33% |
| Efecakann vs Leroy | 3–2 | 60.00% |
| Efecakann vs Leo | 1–3 | 25.00% |
| Efecakann 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.