| Yeffey vs Reina | 68–54 | 55.74% |
| Yeffey vs King | 51–58 | 46.79% |
| Yeffey vs Jin | 48–56 | 46.15% |
| Yeffey vs Kazuya | 47–55 | 46.08% |
| Yeffey vs Steve | 47–49 | 48.96% |
| Yeffey vs Bryan | 39–43 | 47.56% |
| Yeffey vs Azucena | 34–36 | 48.57% |
| Yeffey vs Lili | 27–34 | 44.26% |
| Yeffey vs Jun | 29–30 | 49.15% |
| Yeffey vs Paul | 26–31 | 45.61% |
| Yeffey vs Feng | 27–27 | 50.00% |
| Yeffey vs Dragunov | 27–27 | 50.00% |
| Yeffey vs Lee | 20–30 | 40.00% |
| Yeffey vs Eddy | 20–30 | 40.00% |
| Yeffey vs Yoshimitsu | 19–24 | 44.19% |
| Yeffey vs Hwoarang | 14–24 | 36.84% |
| Yeffey vs Victor | 20–18 | 52.63% |
| Yeffey vs Law | 14–23 | 37.84% |
| Yeffey vs Lars | 17–20 | 45.95% |
| Yeffey vs Asuka | 15–21 | 41.67% |
| Yeffey vs Kuma | 12–22 | 35.29% |
| Yeffey vs Xiaoyu | 15–18 | 45.45% |
| Yeffey vs Leo | 17–16 | 51.52% |
| Yeffey vs Lidia | 12–19 | 38.71% |
| Yeffey vs Nina | 13–16 | 44.83% |
| Yeffey vs Leroy | 15–14 | 51.72% |
| Yeffey vs Devil Jin | 13–12 | 52.00% |
| Yeffey vs Alisa | 9–15 | 37.50% |
| Yeffey vs Shaheen | 5–19 | 20.83% |
| Yeffey vs Jack-8 | 11–12 | 47.83% |
| Yeffey vs Claudio | 4–14 | 22.22% |
| Yeffey vs Raven | 5–11 | 31.25% |
| Yeffey vs Zafina | 0–9 | 0.00% |
| Yeffey vs Panda | 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.