| Koyama_sensei vs King | 9–8 | 52.94% |
| Koyama_sensei vs Kazuya | 8–7 | 53.33% |
| Koyama_sensei vs Paul | 10–4 | 71.43% |
| Koyama_sensei vs Lili | 10–1 | 90.91% |
| Koyama_sensei vs Armor King | 3–7 | 30.00% |
| Koyama_sensei vs Dragunov | 7–2 | 77.78% |
| Koyama_sensei vs Miary Zo | 5–3 | 62.50% |
| Koyama_sensei vs Steve | 7–0 | 100.00% |
| Koyama_sensei vs Jin | 3–3 | 50.00% |
| Koyama_sensei vs Devil Jin | 4–2 | 66.67% |
| Koyama_sensei vs Jack-8 | 1–4 | 20.00% |
| Koyama_sensei vs Nina | 1–4 | 20.00% |
| Koyama_sensei vs Reina | 3–2 | 60.00% |
| Koyama_sensei vs Alisa | 2–2 | 50.00% |
| Koyama_sensei vs Leroy | 4–0 | 100.00% |
| Koyama_sensei vs Jun | 0–4 | 0.00% |
| Koyama_sensei vs Raven | 1–3 | 25.00% |
| Koyama_sensei vs Bryan | 1–2 | 33.33% |
| Koyama_sensei vs Asuka | 2–1 | 66.67% |
| Koyama_sensei vs Leo | 1–2 | 33.33% |
| Koyama_sensei vs Lars | 2–1 | 66.67% |
| Koyama_sensei vs Victor | 1–2 | 33.33% |
| Koyama_sensei vs Lidia | 2–1 | 66.67% |
| Koyama_sensei vs Hwoarang | 2–0 | 100.00% |
| Koyama_sensei vs Lee | 2–0 | 100.00% |
| Koyama_sensei vs Zafina | 0–2 | 0.00% |
| Koyama_sensei vs Eddy | 0–2 | 0.00% |
| Koyama_sensei vs Clive | 2–0 | 100.00% |
| Koyama_sensei vs Fahkumram | 1–1 | 50.00% |
| Koyama_sensei vs Law | 1–0 | 100.00% |
| Koyama_sensei vs Anna | 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.