| William999999 vs Kazuya | 28–27 | 50.91% |
| William999999 vs Reina | 22–24 | 47.83% |
| William999999 vs King | 25–19 | 56.82% |
| William999999 vs Law | 21–20 | 51.22% |
| William999999 vs Jin | 18–23 | 43.90% |
| William999999 vs Bryan | 13–14 | 48.15% |
| William999999 vs Hwoarang | 16–8 | 66.67% |
| William999999 vs Jun | 14–8 | 63.64% |
| William999999 vs Yoshimitsu | 10–11 | 47.62% |
| William999999 vs Steve | 9–12 | 42.86% |
| William999999 vs Devil Jin | 8–13 | 38.10% |
| William999999 vs Clive | 10–11 | 47.62% |
| William999999 vs Lili | 10–10 | 50.00% |
| William999999 vs Lidia | 7–10 | 41.18% |
| William999999 vs Nina | 6–10 | 37.50% |
| William999999 vs Paul | 5–9 | 35.71% |
| William999999 vs Victor | 9–5 | 64.29% |
| William999999 vs Dragunov | 3–10 | 23.08% |
| William999999 vs Eddy | 8–5 | 61.54% |
| William999999 vs Lee | 8–4 | 66.67% |
| William999999 vs Azucena | 8–4 | 66.67% |
| William999999 vs Claudio | 6–5 | 54.55% |
| William999999 vs Lars | 6–4 | 60.00% |
| William999999 vs Asuka | 3–6 | 33.33% |
| William999999 vs Feng | 6–3 | 66.67% |
| William999999 vs Alisa | 2–5 | 28.57% |
| William999999 vs Kuma | 3–2 | 60.00% |
| William999999 vs Jack-8 | 1–3 | 25.00% |
| William999999 vs Zafina | 2–2 | 50.00% |
| William999999 vs Heihachi | 2–2 | 50.00% |
| William999999 vs Leo | 2–1 | 66.67% |
| William999999 vs Leroy | 2–1 | 66.67% |
| William999999 vs Xiaoyu | 0–2 | 0.00% |
| William999999 vs Raven | 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.