| Willy Williamso vs Yoshimitsu | 7–1 | 87.50% |
| Willy Williamso vs Hwoarang | 2–3 | 40.00% |
| Willy Williamso vs Kuma | 1–4 | 20.00% |
| Willy Williamso vs Lidia | 4–1 | 80.00% |
| Willy Williamso vs Law | 4–0 | 100.00% |
| Willy Williamso vs Steve | 2–1 | 66.67% |
| Willy Williamso vs Leo | 2–1 | 66.67% |
| Willy Williamso vs Alisa | 2–1 | 66.67% |
| Willy Williamso vs Devil Jin | 2–0 | 100.00% |
| Willy Williamso vs Lee | 2–0 | 100.00% |
| Willy Williamso vs Jun | 0–2 | 0.00% |
| Willy Williamso vs Raven | 2–0 | 100.00% |
| Willy Williamso vs Xiaoyu | 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.