| Ducek vs Law | 18–15 | 54.55% |
| Ducek vs Hwoarang | 14–18 | 43.75% |
| Ducek vs Kazuya | 7–22 | 24.14% |
| Ducek vs Jin | 14–11 | 56.00% |
| Ducek vs Yoshimitsu | 12–11 | 52.17% |
| Ducek vs Reina | 12–9 | 57.14% |
| Ducek vs Bryan | 7–12 | 36.84% |
| Ducek vs King | 6–12 | 33.33% |
| Ducek vs Steve | 8–10 | 44.44% |
| Ducek vs Jun | 9–9 | 50.00% |
| Ducek vs Lidia | 6–10 | 37.50% |
| Ducek vs Lars | 8–7 | 53.33% |
| Ducek vs Lee | 9–5 | 64.29% |
| Ducek vs Dragunov | 9–4 | 69.23% |
| Ducek vs Lili | 8–4 | 66.67% |
| Ducek vs Alisa | 3–7 | 30.00% |
| Ducek vs Azucena | 7–3 | 70.00% |
| Ducek vs Feng | 3–4 | 42.86% |
| Ducek vs Claudio | 2–5 | 28.57% |
| Ducek vs Nina | 4–3 | 57.14% |
| Ducek vs Eddy | 2–5 | 28.57% |
| Ducek vs Xiaoyu | 4–2 | 66.67% |
| Ducek vs Victor | 2–3 | 40.00% |
| Ducek vs Paul | 0–4 | 0.00% |
| Ducek vs Zafina | 0–4 | 0.00% |
| Ducek vs Devil Jin | 2–1 | 66.67% |
| Ducek vs Shaheen | 1–2 | 33.33% |
| Ducek vs Armor King | 2–1 | 66.67% |
| Ducek vs Asuka | 2–0 | 100.00% |
| Ducek vs Kuma | 2–0 | 100.00% |
| Ducek vs Leroy | 0–2 | 0.00% |
| Ducek vs Raven | 0–2 | 0.00% |
| Ducek vs Heihachi | 0–2 | 0.00% |
| Ducek vs Anna | 2–0 | 100.00% |
| Ducek vs Jack-8 | 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.