| Koyasu vs Kazuya | 23–11 | 67.65% |
| Koyasu vs Dragunov | 21–9 | 70.00% |
| Koyasu vs Jin | 12–15 | 44.44% |
| Koyasu vs Paul | 16–10 | 61.54% |
| Koyasu vs Bryan | 13–7 | 65.00% |
| Koyasu vs Steve | 8–11 | 42.11% |
| Koyasu vs Lars | 8–8 | 50.00% |
| Koyasu vs Lee | 5–10 | 33.33% |
| Koyasu vs Hwoarang | 6–7 | 46.15% |
| Koyasu vs King | 9–3 | 75.00% |
| Koyasu vs Yoshimitsu | 7–5 | 58.33% |
| Koyasu vs Feng | 8–3 | 72.73% |
| Koyasu vs Lidia | 6–5 | 54.55% |
| Koyasu vs Devil Jin | 5–4 | 55.56% |
| Koyasu vs Xiaoyu | 5–3 | 62.50% |
| Koyasu vs Reina | 8–0 | 100.00% |
| Koyasu vs Lili | 2–5 | 28.57% |
| Koyasu vs Law | 3–3 | 50.00% |
| Koyasu vs Shaheen | 4–2 | 66.67% |
| Koyasu vs Victor | 5–1 | 83.33% |
| Koyasu vs Nina | 1–4 | 20.00% |
| Koyasu vs Kuma | 4–1 | 80.00% |
| Koyasu vs Zafina | 2–3 | 40.00% |
| Koyasu vs Leroy | 2–3 | 40.00% |
| Koyasu vs Jun | 4–0 | 100.00% |
| Koyasu vs Jack-8 | 1–1 | 50.00% |
| Koyasu vs Asuka | 0–2 | 0.00% |
| Koyasu vs Leo | 2–0 | 100.00% |
| Koyasu vs Claudio | 2–0 | 100.00% |
| Koyasu vs Azucena | 2–0 | 100.00% |
| Koyasu vs Raven | 0–2 | 0.00% |
| Koyasu vs Eddy | 1–1 | 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.