| Feffo vs Reina | 10–8 | 55.56% |
| Feffo vs King | 9–7 | 56.25% |
| Feffo vs Hwoarang | 9–7 | 56.25% |
| Feffo vs Law | 4–10 | 28.57% |
| Feffo vs Kazuya | 6–4 | 60.00% |
| Feffo vs Dragunov | 5–5 | 50.00% |
| Feffo vs Nina | 5–4 | 55.56% |
| Feffo vs Steve | 3–5 | 37.50% |
| Feffo vs Jin | 5–2 | 71.43% |
| Feffo vs Miary Zo | 1–6 | 14.29% |
| Feffo vs Asuka | 1–5 | 16.67% |
| Feffo vs Lili | 4–2 | 66.67% |
| Feffo vs Victor | 3–2 | 60.00% |
| Feffo vs Eddy | 3–2 | 60.00% |
| Feffo vs Azucena | 1–3 | 25.00% |
| Feffo vs Lee | 2–1 | 66.67% |
| Feffo vs Jun | 1–2 | 33.33% |
| Feffo vs Raven | 1–2 | 33.33% |
| Feffo vs Bryan | 0–2 | 0.00% |
| Feffo vs Lars | 1–1 | 50.00% |
| Feffo vs Alisa | 0–2 | 0.00% |
| Feffo vs Claudio | 0–2 | 0.00% |
| Feffo vs Kuma | 1–1 | 50.00% |
| Feffo vs Lidia | 0–2 | 0.00% |
| Feffo vs Armor King | 0–2 | 0.00% |
| Feffo vs Paul | 0–1 | 0.00% |
| Feffo vs Yoshimitsu | 0–1 | 0.00% |
| Feffo vs Xiaoyu | 0–1 | 0.00% |
| Feffo vs Jack-8 | 0–1 | 0.00% |
| Feffo vs Devil Jin | 1–0 | 100.00% |
| Feffo vs Shaheen | 0–1 | 0.00% |
| Feffo vs Panda | 1–0 | 100.00% |
| Feffo vs Clive | 1–0 | 100.00% |
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.