| Red Kosa vs Eddy | 6–7 | 46.15% |
| Red Kosa vs Hwoarang | 7–2 | 77.78% |
| Red Kosa vs Dragunov | 6–3 | 66.67% |
| Red Kosa vs Azucena | 7–2 | 77.78% |
| Red Kosa vs Law | 6–2 | 75.00% |
| Red Kosa vs Reina | 5–3 | 62.50% |
| Red Kosa vs Victor | 5–1 | 83.33% |
| Red Kosa vs Bryan | 4–1 | 80.00% |
| Red Kosa vs Lili | 4–1 | 80.00% |
| Red Kosa vs Shaheen | 4–1 | 80.00% |
| Red Kosa vs Lee | 5–0 | 100.00% |
| Red Kosa vs Paul | 3–1 | 75.00% |
| Red Kosa vs King | 3–0 | 100.00% |
| Red Kosa vs Kazuya | 3–0 | 100.00% |
| Red Kosa vs Steve | 1–2 | 33.33% |
| Red Kosa vs Devil Jin | 1–2 | 33.33% |
| Red Kosa vs Jun | 2–1 | 66.67% |
| Red Kosa vs Jin | 2–0 | 100.00% |
| Red Kosa vs Asuka | 2–0 | 100.00% |
| Red Kosa vs Claudio | 1–1 | 50.00% |
| Red Kosa vs Jack-8 | 0–1 | 0.00% |
| Red Kosa vs Leo | 0–1 | 0.00% |
| Red Kosa vs Nina | 1–0 | 100.00% |
| Red Kosa vs Raven | 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.