| Billy Seo vs Jin | 69–31 | 69.00% |
| Billy Seo vs Kazuya | 46–42 | 52.27% |
| Billy Seo vs Bryan | 44–37 | 54.32% |
| Billy Seo vs Dragunov | 38–37 | 50.67% |
| Billy Seo vs King | 33–33 | 50.00% |
| Billy Seo vs Lili | 37–28 | 56.92% |
| Billy Seo vs Hwoarang | 23–23 | 50.00% |
| Billy Seo vs Steve | 30–16 | 65.22% |
| Billy Seo vs Reina | 27–15 | 64.29% |
| Billy Seo vs Paul | 26–14 | 65.00% |
| Billy Seo vs Nina | 25–10 | 71.43% |
| Billy Seo vs Yoshimitsu | 18–16 | 52.94% |
| Billy Seo vs Victor | 21–13 | 61.76% |
| Billy Seo vs Alisa | 16–15 | 51.61% |
| Billy Seo vs Jack-8 | 15–14 | 51.72% |
| Billy Seo vs Devil Jin | 14–15 | 48.28% |
| Billy Seo vs Jun | 14–15 | 48.28% |
| Billy Seo vs Xiaoyu | 12–16 | 42.86% |
| Billy Seo vs Feng | 17–9 | 65.38% |
| Billy Seo vs Law | 13–12 | 52.00% |
| Billy Seo vs Leo | 15–10 | 60.00% |
| Billy Seo vs Lars | 11–13 | 45.83% |
| Billy Seo vs Lee | 11–8 | 57.89% |
| Billy Seo vs Kuma | 12–7 | 63.16% |
| Billy Seo vs Claudio | 13–5 | 72.22% |
| Billy Seo vs Eddy | 11–7 | 61.11% |
| Billy Seo vs Lidia | 10–7 | 58.82% |
| Billy Seo vs Leroy | 4–10 | 28.57% |
| Billy Seo vs Azucena | 6–7 | 46.15% |
| Billy Seo vs Asuka | 5–5 | 50.00% |
| Billy Seo vs Panda | 3–5 | 37.50% |
| Billy Seo vs Raven | 4–4 | 50.00% |
| Billy Seo vs Shaheen | 2–5 | 28.57% |
| Billy Seo vs Zafina | 1–5 | 16.67% |
| Billy Seo vs Heihachi | 0–5 | 0.00% |
| Billy Seo vs Clive | 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.