| W1ll1am vs Jin | 9–9 | 50.00% |
| W1ll1am vs King | 9–5 | 64.29% |
| W1ll1am vs Heihachi | 10–4 | 71.43% |
| W1ll1am vs Reina | 6–3 | 66.67% |
| W1ll1am vs Asuka | 1–4 | 20.00% |
| W1ll1am vs Lili | 5–0 | 100.00% |
| W1ll1am vs Clive | 3–2 | 60.00% |
| W1ll1am vs Law | 4–0 | 100.00% |
| W1ll1am vs Hwoarang | 4–0 | 100.00% |
| W1ll1am vs Lee | 3–1 | 75.00% |
| W1ll1am vs Bryan | 2–1 | 66.67% |
| W1ll1am vs Kazuya | 2–1 | 66.67% |
| W1ll1am vs Devil Jin | 1–2 | 33.33% |
| W1ll1am vs Eddy | 1–2 | 33.33% |
| W1ll1am vs Xiaoyu | 0–2 | 0.00% |
| W1ll1am vs Claudio | 0–2 | 0.00% |
| W1ll1am vs Shaheen | 2–0 | 100.00% |
| W1ll1am vs Paul | 1–0 | 100.00% |
| W1ll1am vs Yoshimitsu | 1–0 | 100.00% |
| W1ll1am vs Steve | 1–0 | 100.00% |
| W1ll1am vs Feng | 1–0 | 100.00% |
| W1ll1am vs Dragunov | 0–1 | 0.00% |
| W1ll1am vs Leo | 0–1 | 0.00% |
| W1ll1am vs Kuma | 0–1 | 0.00% |
| W1ll1am vs Azucena | 0–1 | 0.00% |
| W1ll1am vs Victor | 1–0 | 100.00% |
| W1ll1am vs Raven | 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.