| SFD｜LWIlliam vs Hwoarang | 36–22 | 62.07% |
| SFD｜LWIlliam vs Kazuya | 27–12 | 69.23% |
| SFD｜LWIlliam vs Reina | 31–6 | 83.78% |
| SFD｜LWIlliam vs Lili | 23–13 | 63.89% |
| SFD｜LWIlliam vs Dragunov | 26–10 | 72.22% |
| SFD｜LWIlliam vs King | 27–8 | 77.14% |
| SFD｜LWIlliam vs Bryan | 13–13 | 50.00% |
| SFD｜LWIlliam vs Claudio | 23–3 | 88.46% |
| SFD｜LWIlliam vs Law | 18–5 | 78.26% |
| SFD｜LWIlliam vs Steve | 13–10 | 56.52% |
| SFD｜LWIlliam vs Nina | 14–9 | 60.87% |
| SFD｜LWIlliam vs Asuka | 16–5 | 76.19% |
| SFD｜LWIlliam vs Paul | 16–4 | 80.00% |
| SFD｜LWIlliam vs Jin | 17–3 | 85.00% |
| SFD｜LWIlliam vs Devil Jin | 13–7 | 65.00% |
| SFD｜LWIlliam vs Yoshimitsu | 8–10 | 44.44% |
| SFD｜LWIlliam vs Leo | 14–3 | 82.35% |
| SFD｜LWIlliam vs Leroy | 13–3 | 81.25% |
| SFD｜LWIlliam vs Alisa | 11–3 | 78.57% |
| SFD｜LWIlliam vs Jack-8 | 7–6 | 53.85% |
| SFD｜LWIlliam vs Azucena | 10–3 | 76.92% |
| SFD｜LWIlliam vs Xiaoyu | 10–2 | 83.33% |
| SFD｜LWIlliam vs Eddy | 10–2 | 83.33% |
| SFD｜LWIlliam vs Feng | 7–4 | 63.64% |
| SFD｜LWIlliam vs Raven | 5–5 | 50.00% |
| SFD｜LWIlliam vs Lars | 6–3 | 66.67% |
| SFD｜LWIlliam vs Jun | 4–5 | 44.44% |
| SFD｜LWIlliam vs Victor | 5–4 | 55.56% |
| SFD｜LWIlliam vs Fahkumram | 7–2 | 77.78% |
| SFD｜LWIlliam vs Heihachi | 4–4 | 50.00% |
| SFD｜LWIlliam vs Anna | 7–0 | 100.00% |
| SFD｜LWIlliam vs Zafina | 4–2 | 66.67% |
| SFD｜LWIlliam vs Shaheen | 4–1 | 80.00% |
| SFD｜LWIlliam vs Armor King | 3–2 | 60.00% |
| SFD｜LWIlliam vs Lee | 3–1 | 75.00% |
| SFD｜LWIlliam vs Clive | 2–1 | 66.67% |
| SFD｜LWIlliam vs Kuma | 0–2 | 0.00% |
| SFD｜LWIlliam vs Panda | 0–2 | 0.00% |
| SFD｜LWIlliam vs Lidia | 2–0 | 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.