| Willian13 vs Jin | 9–25 | 26.47% |
| Willian13 vs King | 9–19 | 32.14% |
| Willian13 vs Kazuya | 11–17 | 39.29% |
| Willian13 vs Steve | 19–8 | 70.37% |
| Willian13 vs Reina | 12–14 | 46.15% |
| Willian13 vs Bryan | 2–14 | 12.50% |
| Willian13 vs Hwoarang | 8–3 | 72.73% |
| Willian13 vs Armor King | 9–1 | 90.00% |
| Willian13 vs Paul | 8–1 | 88.89% |
| Willian13 vs Law | 6–3 | 66.67% |
| Willian13 vs Alisa | 3–6 | 33.33% |
| Willian13 vs Lili | 6–2 | 75.00% |
| Willian13 vs Eddy | 4–4 | 50.00% |
| Willian13 vs Miary Zo | 7–1 | 87.50% |
| Willian13 vs Asuka | 4–3 | 57.14% |
| Willian13 vs Leo | 2–5 | 28.57% |
| Willian13 vs Heihachi | 4–3 | 57.14% |
| Willian13 vs Yoshimitsu | 3–3 | 50.00% |
| Willian13 vs Azucena | 3–3 | 50.00% |
| Willian13 vs Dragunov | 4–1 | 80.00% |
| Willian13 vs Jun | 3–2 | 60.00% |
| Willian13 vs Raven | 3–2 | 60.00% |
| Willian13 vs Feng | 0–4 | 0.00% |
| Willian13 vs Claudio | 0–4 | 0.00% |
| Willian13 vs Nina | 3–1 | 75.00% |
| Willian13 vs Lidia | 1–3 | 25.00% |
| Willian13 vs Fahkumram | 4–0 | 100.00% |
| Willian13 vs Lars | 2–1 | 66.67% |
| Willian13 vs Xiaoyu | 2–0 | 100.00% |
| Willian13 vs Devil Jin | 2–0 | 100.00% |
| Willian13 vs Lee | 0–2 | 0.00% |
| Willian13 vs Leroy | 2–0 | 100.00% |
| Willian13 vs Clive | 2–0 | 100.00% |
| Willian13 vs Anna | 2–0 | 100.00% |
| Willian13 vs Victor | 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.