| Kostas vs Law | 9–4 | 69.23% |
| Kostas vs King | 6–7 | 46.15% |
| Kostas vs Jin | 9–4 | 69.23% |
| Kostas vs Hwoarang | 7–3 | 70.00% |
| Kostas vs Kazuya | 6–4 | 60.00% |
| Kostas vs Lidia | 8–2 | 80.00% |
| Kostas vs Anna | 6–1 | 85.71% |
| Kostas vs Bryan | 3–2–1 | 60.00% |
| Kostas vs Jack-8 | 4–2 | 66.67% |
| Kostas vs Xiaoyu | 2–3 | 40.00% |
| Kostas vs Steve | 2–3 | 40.00% |
| Kostas vs Yoshimitsu | 3–1 | 75.00% |
| Kostas vs Lee | 2–2 | 50.00% |
| Kostas vs Reina | 2–2 | 50.00% |
| Kostas vs Azucena | 2–2 | 50.00% |
| Kostas vs Eddy | 3–1 | 75.00% |
| Kostas vs Dragunov | 2–1 | 66.67% |
| Kostas vs Leroy | 2–1 | 66.67% |
| Kostas vs Victor | 3–0 | 100.00% |
| Kostas vs Paul | 2–0 | 100.00% |
| Kostas vs Lili | 1–1 | 50.00% |
| Kostas vs Alisa | 0–2 | 0.00% |
| Kostas vs Nina | 2–0 | 100.00% |
| Kostas vs Jun | 1–1 | 50.00% |
| Kostas vs Heihachi | 0–2 | 0.00% |
| Kostas vs Lars | 0–1 | 0.00% |
| Kostas vs Clive | 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.