| Kowalski vs Jin | 175–146 | 54.52% |
| Kowalski vs Kazuya | 115–162 | 41.52% |
| Kowalski vs Law | 86–130 | 39.81% |
| Kowalski vs King | 70–122 | 36.46% |
| Kowalski vs Steve | 76–110 | 40.86% |
| Kowalski vs Hwoarang | 98–82 | 54.44% |
| Kowalski vs Heihachi | 85–94 | 47.49% |
| Kowalski vs Bryan | 67–111 | 37.64% |
| Kowalski vs Lili | 69–74 | 48.25% |
| Kowalski vs Dragunov | 69–52 | 57.02% |
| Kowalski vs Reina | 50–47 | 51.55% |
| Kowalski vs Clive | 50–47 | 51.55% |
| Kowalski vs Paul | 38–57 | 40.00% |
| Kowalski vs Yoshimitsu | 39–48 | 44.83% |
| Kowalski vs Fahkumram | 44–40 | 52.38% |
| Kowalski vs Armor King | 37–47 | 44.05% |
| Kowalski vs Jun | 38–45 | 45.78% |
| Kowalski vs Lee | 34–48 | 41.46% |
| Kowalski vs Lars | 34–42 | 44.74% |
| Kowalski vs Eddy | 28–46 | 37.84% |
| Kowalski vs Victor | 35–36 | 49.30% |
| Kowalski vs Devil Jin | 31–38 | 44.93% |
| Kowalski vs Asuka | 27–37 | 42.19% |
| Kowalski vs Azucena | 30–33 | 47.62% |
| Kowalski vs Anna | 19–41 | 31.67% |
| Kowalski vs Nina | 24–31 | 43.64% |
| Kowalski vs Alisa | 16–35 | 31.37% |
| Kowalski vs Raven | 18–33 | 35.29% |
| Kowalski vs Xiaoyu | 28–22 | 56.00% |
| Kowalski vs Lidia | 27–23 | 54.00% |
| Kowalski vs Feng | 14–24 | 36.84% |
| Kowalski vs Miary Zo | 13–20 | 39.39% |
| Kowalski vs Leo | 14–17 | 45.16% |
| Kowalski vs Kuma | 12–17 | 41.38% |
| Kowalski vs Leroy | 11–16 | 40.74% |
| Kowalski vs Jack-8 | 11–14 | 44.00% |
| Kowalski vs Shaheen | 10–13 | 43.48% |
| Kowalski vs Claudio | 4–10 | 28.57% |
| Kowalski vs Panda | 4–8 | 33.33% |
| Kowalski vs Zafina | 5–7 | 41.67% |
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.