| Stefanek vs Jin | 29–43 | 40.28% |
| Stefanek vs Hwoarang | 22–34 | 39.29% |
| Stefanek vs Kazuya | 28–26 | 51.85% |
| Stefanek vs Reina | 22–27 | 44.90% |
| Stefanek vs Eddy | 7–31 | 18.42% |
| Stefanek vs King | 13–18 | 41.94% |
| Stefanek vs Paul | 12–18 | 40.00% |
| Stefanek vs Steve | 8–20 | 28.57% |
| Stefanek vs Bryan | 10–16 | 38.46% |
| Stefanek vs Yoshimitsu | 14–10 | 58.33% |
| Stefanek vs Lili | 7–17 | 29.17% |
| Stefanek vs Nina | 10–11 | 47.62% |
| Stefanek vs Asuka | 8–12 | 40.00% |
| Stefanek vs Lars | 7–13 | 35.00% |
| Stefanek vs Lee | 2–18 | 10.00% |
| Stefanek vs Dragunov | 6–12 | 33.33% |
| Stefanek vs Law | 3–12 | 20.00% |
| Stefanek vs Xiaoyu | 5–10 | 33.33% |
| Stefanek vs Leo | 3–12 | 20.00% |
| Stefanek vs Jun | 7–8 | 46.67% |
| Stefanek vs Victor | 4–11 | 26.67% |
| Stefanek vs Jack-8 | 5–9 | 35.71% |
| Stefanek vs Leroy | 7–7 | 50.00% |
| Stefanek vs Feng | 3–9 | 25.00% |
| Stefanek vs Azucena | 6–6 | 50.00% |
| Stefanek vs Claudio | 5–4 | 55.56% |
| Stefanek vs Devil Jin | 2–6 | 25.00% |
| Stefanek vs Kuma | 2–5 | 28.57% |
| Stefanek vs Raven | 0–7 | 0.00% |
| Stefanek vs Shaheen | 4–2 | 66.67% |
| Stefanek vs Heihachi | 2–4 | 33.33% |
| Stefanek vs Alisa | 0–5 | 0.00% |
| Stefanek vs Panda | 2–2 | 50.00% |
| Stefanek vs Lidia | 1–3 | 25.00% |
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.