| King William vs Kazuya | 15–6 | 71.43% |
| King William vs Steve | 10–7 | 58.82% |
| King William vs King | 11–5 | 68.75% |
| King William vs Bryan | 11–4 | 73.33% |
| King William vs Dragunov | 8–5 | 61.54% |
| King William vs Yoshimitsu | 7–4 | 63.64% |
| King William vs Raven | 9–2 | 81.82% |
| King William vs Law | 6–4 | 60.00% |
| King William vs Reina | 6–4 | 60.00% |
| King William vs Azucena | 7–3 | 70.00% |
| King William vs Jin | 8–1 | 88.89% |
| King William vs Eddy | 6–3 | 66.67% |
| King William vs Paul | 4–4 | 50.00% |
| King William vs Alisa | 6–2 | 75.00% |
| King William vs Asuka | 4–3 | 57.14% |
| King William vs Devil Jin | 4–3 | 57.14% |
| King William vs Feng | 3–4 | 42.86% |
| King William vs Heihachi | 3–4 | 42.86% |
| King William vs Claudio | 4–2 | 66.67% |
| King William vs Xiaoyu | 2–3 | 40.00% |
| King William vs Lars | 2–3 | 40.00% |
| King William vs Shaheen | 4–1 | 80.00% |
| King William vs Lidia | 2–3 | 40.00% |
| King William vs Hwoarang | 4–0 | 100.00% |
| King William vs Lee | 1–3 | 25.00% |
| King William vs Leroy | 2–2 | 50.00% |
| King William vs Jun | 2–2 | 50.00% |
| King William vs Anna | 2–2 | 50.00% |
| King William vs Armor King | 3–1 | 75.00% |
| King William vs Jack-8 | 2–1 | 66.67% |
| King William vs Lili | 2–1 | 66.67% |
| King William vs Leo | 2–1 | 66.67% |
| King William vs Nina | 3–0 | 100.00% |
| King William vs Kuma | 2–1 | 66.67% |
| King William vs Victor | 3–0 | 100.00% |
| King William vs Clive | 1–2 | 33.33% |
| King William vs Miary Zo | 1–2 | 33.33% |
| King William vs Panda | 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.