| William Rey vs Kazuya | 4–12 | 25.00% |
| William Rey vs Jin | 8–7 | 53.33% |
| William Rey vs Steve | 4–6 | 40.00% |
| William Rey vs Asuka | 5–4 | 55.56% |
| William Rey vs Dragunov | 5–4 | 55.56% |
| William Rey vs King | 9–0 | 100.00% |
| William Rey vs Zafina | 1–8 | 11.11% |
| William Rey vs Reina | 7–1 | 87.50% |
| William Rey vs Azucena | 3–4 | 42.86% |
| William Rey vs Yoshimitsu | 3–2 | 60.00% |
| William Rey vs Paul | 1–4 | 20.00% |
| William Rey vs Bryan | 2–3 | 40.00% |
| William Rey vs Heihachi | 3–2 | 60.00% |
| William Rey vs Lee | 4–0 | 100.00% |
| William Rey vs Hwoarang | 1–2 | 33.33% |
| William Rey vs Feng | 1–2 | 33.33% |
| William Rey vs Lili | 1–2 | 33.33% |
| William Rey vs Leo | 2–1 | 66.67% |
| William Rey vs Alisa | 3–0 | 100.00% |
| William Rey vs Nina | 1–2 | 33.33% |
| William Rey vs Jun | 3–0 | 100.00% |
| William Rey vs Victor | 1–2 | 33.33% |
| William Rey vs Xiaoyu | 0–2 | 0.00% |
| William Rey vs Leroy | 1–1 | 50.00% |
| William Rey vs Lars | 0–2 | 0.00% |
| William Rey vs Shaheen | 2–0 | 100.00% |
| William Rey vs Raven | 0–2 | 0.00% |
| William Rey vs Eddy | 2–0 | 100.00% |
| William Rey vs Law | 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.