| Kowalski vs Kazuya | 39–21 | 65.00% |
| Kowalski vs Bryan | 33–21 | 61.11% |
| Kowalski vs Jin | 24–26 | 48.00% |
| Kowalski vs King | 23–19 | 54.76% |
| Kowalski vs Law | 24–13 | 64.86% |
| Kowalski vs Paul | 18–17 | 51.43% |
| Kowalski vs Steve | 17–17 | 50.00% |
| Kowalski vs Dragunov | 18–14 | 56.25% |
| Kowalski vs Hwoarang | 18–12 | 60.00% |
| Kowalski vs Heihachi | 19–9 | 67.86% |
| Kowalski vs Yoshimitsu | 12–10 | 54.55% |
| Kowalski vs Devil Jin | 8–14 | 36.36% |
| Kowalski vs Asuka | 9–12 | 42.86% |
| Kowalski vs Alisa | 8–12 | 40.00% |
| Kowalski vs Nina | 6–12 | 33.33% |
| Kowalski vs Lee | 7–9 | 43.75% |
| Kowalski vs Reina | 12–4 | 75.00% |
| Kowalski vs Leroy | 10–4 | 71.43% |
| Kowalski vs Victor | 5–9 | 35.71% |
| Kowalski vs Lili | 3–9 | 25.00% |
| Kowalski vs Claudio | 2–10 | 16.67% |
| Kowalski vs Jack-8 | 4–7 | 36.36% |
| Kowalski vs Feng | 6–5 | 54.55% |
| Kowalski vs Leo | 4–7 | 36.36% |
| Kowalski vs Lars | 5–6 | 45.45% |
| Kowalski vs Azucena | 4–6 | 40.00% |
| Kowalski vs Eddy | 8–2 | 80.00% |
| Kowalski vs Xiaoyu | 4–5 | 44.44% |
| Kowalski vs Zafina | 2–4 | 33.33% |
| Kowalski vs Jun | 2–4 | 33.33% |
| Kowalski vs Lidia | 4–2 | 66.67% |
| Kowalski vs Anna | 3–3 | 50.00% |
| Kowalski vs Kuma | 4–1 | 80.00% |
| Kowalski vs Panda | 2–3 | 40.00% |
| Kowalski vs Clive | 4–1 | 80.00% |
| Kowalski vs Raven | 2–0 | 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.