| Kostas vs Jin | 58–51 | 53.21% |
| Kostas vs Hwoarang | 35–44 | 44.30% |
| Kostas vs Kazuya | 32–32 | 50.00% |
| Kostas vs Reina | 31–32 | 49.21% |
| Kostas vs King | 33–28 | 54.10% |
| Kostas vs Heihachi | 27–27 | 50.00% |
| Kostas vs Bryan | 29–24 | 54.72% |
| Kostas vs Yoshimitsu | 28–24 | 53.85% |
| Kostas vs Steve | 24–28 | 46.15% |
| Kostas vs Lili | 27–25 | 51.92% |
| Kostas vs Law | 28–23 | 54.90% |
| Kostas vs Jun | 20–21 | 48.78% |
| Kostas vs Asuka | 16–22 | 42.11% |
| Kostas vs Eddy | 21–17 | 55.26% |
| Kostas vs Lars | 13–21 | 38.24% |
| Kostas vs Devil Jin | 12–18 | 40.00% |
| Kostas vs Paul | 16–11 | 59.26% |
| Kostas vs Xiaoyu | 12–15 | 44.44% |
| Kostas vs Dragunov | 15–12 | 55.56% |
| Kostas vs Victor | 12–12 | 50.00% |
| Kostas vs Nina | 11–12 | 47.83% |
| Kostas vs Alisa | 9–13 | 40.91% |
| Kostas vs Jack-8 | 11–10 | 52.38% |
| Kostas vs Feng | 8–13 | 38.10% |
| Kostas vs Azucena | 9–12 | 42.86% |
| Kostas vs Raven | 5–13 | 27.78% |
| Kostas vs Clive | 4–9 | 30.77% |
| Kostas vs Lee | 5–7 | 41.67% |
| Kostas vs Leroy | 7–5 | 58.33% |
| Kostas vs Lidia | 2–10 | 16.67% |
| Kostas vs Zafina | 4–7 | 36.36% |
| Kostas vs Kuma | 5–5 | 50.00% |
| Kostas vs Leo | 3–5 | 37.50% |
| Kostas vs Claudio | 3–4 | 42.86% |
| Kostas vs Shaheen | 4–3 | 57.14% |
| Kostas vs Panda | 2–5 | 28.57% |
| Kostas vs Anna | 2–4 | 33.33% |
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.