| GMR|RealKostlaw vs King | 51–41 | 55.43% |
| GMR|RealKostlaw vs Heihachi | 29–38 | 43.28% |
| GMR|RealKostlaw vs Law | 34–26 | 56.67% |
| GMR|RealKostlaw vs Kazuya | 34–23 | 59.65% |
| GMR|RealKostlaw vs Jin | 27–21 | 56.25% |
| GMR|RealKostlaw vs Dragunov | 25–19 | 56.82% |
| GMR|RealKostlaw vs Bryan | 20–22 | 47.62% |
| GMR|RealKostlaw vs Steve | 19–18–1 | 51.35% |
| GMR|RealKostlaw vs Victor | 18–18 | 50.00% |
| GMR|RealKostlaw vs Hwoarang | 18–15 | 54.55% |
| GMR|RealKostlaw vs Paul | 17–15 | 53.12% |
| GMR|RealKostlaw vs Reina | 14–18 | 43.75% |
| GMR|RealKostlaw vs Eddy | 11–21 | 34.38% |
| GMR|RealKostlaw vs Feng | 13–18 | 41.94% |
| GMR|RealKostlaw vs Armor King | 14–16 | 46.67% |
| GMR|RealKostlaw vs Asuka | 21–8 | 72.41% |
| GMR|RealKostlaw vs Lars | 16–9 | 64.00% |
| GMR|RealKostlaw vs Jun | 7–15 | 31.82% |
| GMR|RealKostlaw vs Yoshimitsu | 8–13 | 38.10% |
| GMR|RealKostlaw vs Lili | 9–12 | 42.86% |
| GMR|RealKostlaw vs Nina | 13–7 | 65.00% |
| GMR|RealKostlaw vs Jack-8 | 7–12 | 36.84% |
| GMR|RealKostlaw vs Leo | 10–7 | 58.82% |
| GMR|RealKostlaw vs Azucena | 5–10 | 33.33% |
| GMR|RealKostlaw vs Anna | 8–7 | 53.33% |
| GMR|RealKostlaw vs Raven | 10–4 | 71.43% |
| GMR|RealKostlaw vs Clive | 6–7 | 46.15% |
| GMR|RealKostlaw vs Miary Zo | 7–6 | 53.85% |
| GMR|RealKostlaw vs Alisa | 3–9 | 25.00% |
| GMR|RealKostlaw vs Leroy | 3–9 | 25.00% |
| GMR|RealKostlaw vs Zafina | 6–5 | 54.55% |
| GMR|RealKostlaw vs Devil Jin | 3–7 | 30.00% |
| GMR|RealKostlaw vs Lidia | 7–2 | 77.78% |
| GMR|RealKostlaw vs Xiaoyu | 3–4 | 42.86% |
| GMR|RealKostlaw vs Fahkumram | 2–3 | 40.00% |
| GMR|RealKostlaw vs Lee | 2–2 | 50.00% |
| GMR|RealKostlaw vs Panda | 2–2 | 50.00% |
| GMR|RealKostlaw vs Kuma | 2–1 | 66.67% |
| GMR|RealKostlaw vs Claudio | 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.