| William Grayson vs Kazuya | 24–16 | 60.00% |
| William Grayson vs Jin | 21–17 | 55.26% |
| William Grayson vs King | 18–15 | 54.55% |
| William Grayson vs Reina | 18–10 | 64.29% |
| William Grayson vs Paul | 10–9 | 52.63% |
| William Grayson vs Eddy | 10–9 | 52.63% |
| William Grayson vs Hwoarang | 7–11 | 38.89% |
| William Grayson vs Dragunov | 9–9 | 50.00% |
| William Grayson vs Victor | 7–10 | 41.18% |
| William Grayson vs Steve | 9–5 | 64.29% |
| William Grayson vs Nina | 9–5 | 64.29% |
| William Grayson vs Law | 5–8 | 38.46% |
| William Grayson vs Bryan | 5–7 | 41.67% |
| William Grayson vs Lars | 8–4 | 66.67% |
| William Grayson vs Azucena | 8–4 | 66.67% |
| William Grayson vs Yoshimitsu | 3–8 | 27.27% |
| William Grayson vs Feng | 3–7 | 30.00% |
| William Grayson vs Lili | 5–5 | 50.00% |
| William Grayson vs Asuka | 5–4 | 55.56% |
| William Grayson vs Alisa | 2–6 | 25.00% |
| William Grayson vs Claudio | 3–5 | 37.50% |
| William Grayson vs Leroy | 3–5 | 37.50% |
| William Grayson vs Jun | 2–6 | 25.00% |
| William Grayson vs Leo | 5–2 | 71.43% |
| William Grayson vs Lee | 3–3 | 50.00% |
| William Grayson vs Xiaoyu | 0–5 | 0.00% |
| William Grayson vs Lidia | 2–3 | 40.00% |
| William Grayson vs Raven | 1–3 | 25.00% |
| William Grayson vs Jack-8 | 1–2 | 33.33% |
| William Grayson vs Zafina | 0–3 | 0.00% |
| William Grayson vs Devil Jin | 2–0 | 100.00% |
| William Grayson vs Shaheen | 2–0 | 100.00% |
| William Grayson vs Kuma | 2–0 | 100.00% |
| William Grayson vs Panda | 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.