| Willis vs Reina | 8–11 | 42.11% |
| Willis vs Hwoarang | 8–6 | 57.14% |
| Willis vs Azucena | 3–7 | 30.00% |
| Willis vs Asuka | 1–8 | 11.11% |
| Willis vs Eddy | 2–7 | 22.22% |
| Willis vs King | 4–4 | 50.00% |
| Willis vs Bryan | 2–6 | 25.00% |
| Willis vs Lars | 2–6 | 25.00% |
| Willis vs Jun | 0–8 | 0.00% |
| Willis vs Yoshimitsu | 2–5 | 28.57% |
| Willis vs Victor | 3–3 | 50.00% |
| Willis vs Feng | 3–3 | 50.00% |
| Willis vs Nina | 2–3 | 40.00% |
| Willis vs Leo | 0–4 | 0.00% |
| Willis vs Alisa | 0–4 | 0.00% |
| Willis vs Lee | 4–0 | 100.00% |
| Willis vs Panda | 2–2 | 50.00% |
| Willis vs Jin | 2–2 | 50.00% |
| Willis vs Xiaoyu | 1–2 | 33.33% |
| Willis vs Steve | 0–3 | 0.00% |
| Willis vs Devil Jin | 1–2 | 33.33% |
| Willis vs Dragunov | 0–3 | 0.00% |
| Willis vs Zafina | 2–1 | 66.67% |
| Willis vs Leroy | 1–2 | 33.33% |
| Willis vs Kazuya | 2–0 | 100.00% |
| Willis vs Claudio | 2–0 | 100.00% |
| Willis vs Paul | 0–2 | 0.00% |
| Willis vs Law | 0–2 | 0.00% |
| Willis vs Jack-8 | 2–0 | 100.00% |
| Willis vs Raven | 0–2 | 0.00% |
| Willis vs Lidia | 0–2 | 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.