| Grumza vs King | 29–25 | 53.70% |
| Grumza vs Kazuya | 30–20 | 60.00% |
| Grumza vs Jin | 20–24 | 45.45% |
| Grumza vs Paul | 22–14 | 61.11% |
| Grumza vs Reina | 11–25 | 30.56% |
| Grumza vs Yoshimitsu | 22–12 | 64.71% |
| Grumza vs Bryan | 18–12 | 60.00% |
| Grumza vs Hwoarang | 15–12 | 55.56% |
| Grumza vs Steve | 12–14 | 46.15% |
| Grumza vs Lee | 16–10 | 61.54% |
| Grumza vs Lars | 10–14 | 41.67% |
| Grumza vs Law | 8–15 | 34.78% |
| Grumza vs Claudio | 14–7 | 66.67% |
| Grumza vs Asuka | 14–6 | 70.00% |
| Grumza vs Dragunov | 8–12 | 40.00% |
| Grumza vs Nina | 13–7 | 65.00% |
| Grumza vs Raven | 7–13 | 35.00% |
| Grumza vs Xiaoyu | 7–12 | 36.84% |
| Grumza vs Azucena | 7–12 | 36.84% |
| Grumza vs Jack-8 | 9–8 | 52.94% |
| Grumza vs Feng | 10–7 | 58.82% |
| Grumza vs Victor | 3–10–1 | 23.08% |
| Grumza vs Zafina | 4–9 | 30.77% |
| Grumza vs Eddy | 9–4 | 69.23% |
| Grumza vs Jun | 4–7 | 36.36% |
| Grumza vs Leo | 4–6 | 40.00% |
| Grumza vs Devil Jin | 3–6 | 33.33% |
| Grumza vs Lili | 5–3 | 62.50% |
| Grumza vs Leroy | 4–4 | 50.00% |
| Grumza vs Heihachi | 4–3 | 57.14% |
| Grumza vs Panda | 3–3 | 50.00% |
| Grumza vs Kuma | 2–3 | 40.00% |
| Grumza vs Alisa | 1–2 | 33.33% |
| Grumza vs Shaheen | 1–1 | 50.00% |
| Grumza vs Lidia | 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.