| Willyum vs King | 11–27 | 28.95% |
| Willyum vs Jin | 16–18 | 47.06% |
| Willyum vs Reina | 17–16 | 51.52% |
| Willyum vs Clive | 7–18 | 28.00% |
| Willyum vs Hwoarang | 8–15 | 34.78% |
| Willyum vs Jun | 6–17 | 26.09% |
| Willyum vs Steve | 7–14 | 33.33% |
| Willyum vs Devil Jin | 10–11 | 47.62% |
| Willyum vs Feng | 4–15 | 21.05% |
| Willyum vs Kazuya | 9–9 | 50.00% |
| Willyum vs Lili | 5–13 | 27.78% |
| Willyum vs Yoshimitsu | 5–12 | 29.41% |
| Willyum vs Azucena | 2–15 | 11.76% |
| Willyum vs Dragunov | 6–10 | 37.50% |
| Willyum vs Victor | 4–12 | 25.00% |
| Willyum vs Bryan | 6–9 | 40.00% |
| Willyum vs Law | 3–11 | 21.43% |
| Willyum vs Xiaoyu | 2–12 | 14.29% |
| Willyum vs Alisa | 8–6 | 57.14% |
| Willyum vs Heihachi | 4–10 | 28.57% |
| Willyum vs Leo | 4–7 | 36.36% |
| Willyum vs Lee | 5–5 | 50.00% |
| Willyum vs Leroy | 1–8 | 11.11% |
| Willyum vs Lidia | 4–5 | 44.44% |
| Willyum vs Lars | 5–3 | 62.50% |
| Willyum vs Nina | 2–6 | 25.00% |
| Willyum vs Zafina | 4–3 | 57.14% |
| Willyum vs Anna | 2–5 | 28.57% |
| Willyum vs Eddy | 3–3 | 50.00% |
| Willyum vs Raven | 2–3 | 40.00% |
| Willyum vs Claudio | 0–4 | 0.00% |
| Willyum vs Asuka | 0–3 | 0.00% |
| Willyum vs Panda | 0–3 | 0.00% |
| Willyum vs Paul | 0–2 | 0.00% |
| Willyum vs Jack-8 | 2–0 | 100.00% |
| Willyum vs Shaheen | 2–0 | 100.00% |
| Willyum vs Kuma | 0–1 | 0.00% |
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.