| Kowalski vs Kazuya | 155–83 | 65.13% |
| Kowalski vs Heihachi | 90–60 | 60.00% |
| Kowalski vs Bryan | 80–53 | 60.15% |
| Kowalski vs Reina | 84–37 | 69.42% |
| Kowalski vs Dragunov | 61–55 | 52.59% |
| Kowalski vs Jin | 79–31 | 71.82% |
| Kowalski vs Steve | 59–47 | 55.66% |
| Kowalski vs King | 51–32 | 61.45% |
| Kowalski vs Lili | 47–33 | 58.75% |
| Kowalski vs Paul | 51–28 | 64.56% |
| Kowalski vs Hwoarang | 47–29 | 61.84% |
| Kowalski vs Devil Jin | 53–23 | 69.74% |
| Kowalski vs Yoshimitsu | 41–27 | 60.29% |
| Kowalski vs Law | 40–25 | 61.54% |
| Kowalski vs Armor King | 41–22 | 65.08% |
| Kowalski vs Lee | 42–19 | 68.85% |
| Kowalski vs Feng | 27–25 | 51.92% |
| Kowalski vs Jun | 35–17 | 67.31% |
| Kowalski vs Asuka | 38–12 | 76.00% |
| Kowalski vs Miary Zo | 23–24 | 48.94% |
| Kowalski vs Lars | 23–18 | 56.10% |
| Kowalski vs Jack-8 | 23–17 | 57.50% |
| Kowalski vs Nina | 23–15 | 60.53% |
| Kowalski vs Victor | 19–19 | 50.00% |
| Kowalski vs Clive | 19–19 | 50.00% |
| Kowalski vs Leroy | 23–12 | 65.71% |
| Kowalski vs Fahkumram | 18–15 | 54.55% |
| Kowalski vs Eddy | 15–16 | 48.39% |
| Kowalski vs Leo | 23–7 | 76.67% |
| Kowalski vs Lidia | 15–12 | 55.56% |
| Kowalski vs Xiaoyu | 13–13 | 50.00% |
| Kowalski vs Azucena | 13–13 | 50.00% |
| Kowalski vs Alisa | 19–5 | 79.17% |
| Kowalski vs Anna | 13–11 | 54.17% |
| Kowalski vs Claudio | 9–14 | 39.13% |
| Kowalski vs Shaheen | 12–9 | 57.14% |
| Kowalski vs Kuma | 12–5 | 70.59% |
| Kowalski vs Zafina | 7–7 | 50.00% |
| Kowalski vs Raven | 10–3 | 76.92% |
| Kowalski vs Panda | 1–4 | 20.00% |
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.