| Kazuya Mashima vs Kazuya | 55–23 | 70.51% |
| Kazuya Mashima vs Bryan | 45–11 | 80.36% |
| Kazuya Mashima vs Reina | 37–17 | 68.52% |
| Kazuya Mashima vs Heihachi | 38–15 | 71.70% |
| Kazuya Mashima vs Steve | 30–10 | 75.00% |
| Kazuya Mashima vs Yoshimitsu | 18–20 | 47.37% |
| Kazuya Mashima vs Hwoarang | 20–16 | 55.56% |
| Kazuya Mashima vs King | 25–10 | 71.43% |
| Kazuya Mashima vs Azucena | 20–15 | 57.14% |
| Kazuya Mashima vs Jin | 23–11 | 67.65% |
| Kazuya Mashima vs Paul | 25–8 | 75.76% |
| Kazuya Mashima vs Leo | 17–14 | 54.84% |
| Kazuya Mashima vs Dragunov | 18–12 | 60.00% |
| Kazuya Mashima vs Asuka | 25–4 | 86.21% |
| Kazuya Mashima vs Lars | 17–12 | 58.62% |
| Kazuya Mashima vs Xiaoyu | 13–15 | 46.43% |
| Kazuya Mashima vs Lili | 19–9 | 67.86% |
| Kazuya Mashima vs Lee | 15–10 | 60.00% |
| Kazuya Mashima vs Leroy | 11–13 | 45.83% |
| Kazuya Mashima vs Law | 9–11 | 45.00% |
| Kazuya Mashima vs Devil Jin | 12–8 | 60.00% |
| Kazuya Mashima vs Jun | 10–10 | 50.00% |
| Kazuya Mashima vs Feng | 10–9 | 52.63% |
| Kazuya Mashima vs Claudio | 12–6 | 66.67% |
| Kazuya Mashima vs Nina | 7–11 | 38.89% |
| Kazuya Mashima vs Kuma | 12–6 | 66.67% |
| Kazuya Mashima vs Victor | 10–8 | 55.56% |
| Kazuya Mashima vs Alisa | 7–9 | 43.75% |
| Kazuya Mashima vs Raven | 6–10 | 37.50% |
| Kazuya Mashima vs Jack-8 | 8–7 | 53.33% |
| Kazuya Mashima vs Shaheen | 13–2 | 86.67% |
| Kazuya Mashima vs Zafina | 8–7 | 53.33% |
| Kazuya Mashima vs Fahkumram | 9–4 | 69.23% |
| Kazuya Mashima vs Clive | 4–6 | 40.00% |
| Kazuya Mashima vs Eddy | 3–5 | 37.50% |
| Kazuya Mashima vs Anna | 5–0 | 100.00% |
| Kazuya Mashima vs Panda | 1–3 | 25.00% |
| Kazuya Mashima vs Lidia | 2–0 | 100.00% |
| Kazuya Mashima vs Armor King | 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.