| Mastwer vs Kazuya | 25–41 | 37.88% |
| Mastwer vs Jin | 38–25 | 60.32% |
| Mastwer vs King | 23–18 | 56.10% |
| Mastwer vs Bryan | 18–21 | 46.15% |
| Mastwer vs Reina | 20–9 | 68.97% |
| Mastwer vs Hwoarang | 19–9 | 67.86% |
| Mastwer vs Heihachi | 9–17 | 34.62% |
| Mastwer vs Steve | 17–7 | 70.83% |
| Mastwer vs Lili | 14–8 | 63.64% |
| Mastwer vs Dragunov | 10–12 | 45.45% |
| Mastwer vs Lee | 10–10 | 50.00% |
| Mastwer vs Yoshimitsu | 8–10 | 44.44% |
| Mastwer vs Paul | 10–6 | 62.50% |
| Mastwer vs Law | 7–9 | 43.75% |
| Mastwer vs Asuka | 8–8 | 50.00% |
| Mastwer vs Alisa | 8–8 | 50.00% |
| Mastwer vs Azucena | 9–7 | 56.25% |
| Mastwer vs Victor | 12–3 | 80.00% |
| Mastwer vs Lars | 11–1 | 91.67% |
| Mastwer vs Anna | 7–4 | 63.64% |
| Mastwer vs Devil Jin | 7–3 | 70.00% |
| Mastwer vs Leroy | 3–7 | 30.00% |
| Mastwer vs Lidia | 2–8 | 20.00% |
| Mastwer vs Clive | 6–4 | 60.00% |
| Mastwer vs Armor King | 4–6 | 40.00% |
| Mastwer vs Eddy | 6–3 | 66.67% |
| Mastwer vs Claudio | 3–5 | 37.50% |
| Mastwer vs Zafina | 3–5 | 37.50% |
| Mastwer vs Leo | 4–3 | 57.14% |
| Mastwer vs Fahkumram | 6–1 | 85.71% |
| Mastwer vs Xiaoyu | 6–0 | 100.00% |
| Mastwer vs Jun | 3–3 | 50.00% |
| Mastwer vs Raven | 2–4 | 33.33% |
| Mastwer vs Miary Zo | 0–6 | 0.00% |
| Mastwer vs Jack-8 | 2–3 | 40.00% |
| Mastwer vs Shaheen | 5–0 | 100.00% |
| Mastwer vs Nina | 0–5 | 0.00% |
| Mastwer vs Kuma | 4–0 | 100.00% |
| Mastwer vs Feng | 1–2 | 33.33% |
| Mastwer 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.