| Seiken vs Bryan | 39–24 | 61.90% |
| Seiken vs Kazuya | 35–28 | 55.56% |
| Seiken vs Heihachi | 29–27 | 51.79% |
| Seiken vs Reina | 25–19 | 56.82% |
| Seiken vs King | 29–14 | 67.44% |
| Seiken vs Clive | 22–19 | 53.66% |
| Seiken vs Steve | 20–19 | 51.28% |
| Seiken vs Yoshimitsu | 13–21 | 38.24% |
| Seiken vs Jin | 16–16 | 50.00% |
| Seiken vs Lee | 16–16 | 50.00% |
| Seiken vs Lili | 9–21 | 30.00% |
| Seiken vs Hwoarang | 16–10 | 61.54% |
| Seiken vs Xiaoyu | 13–12 | 52.00% |
| Seiken vs Lidia | 16–8 | 66.67% |
| Seiken vs Law | 15–7 | 68.18% |
| Seiken vs Azucena | 13–9 | 59.09% |
| Seiken vs Asuka | 12–9 | 57.14% |
| Seiken vs Nina | 15–6 | 71.43% |
| Seiken vs Devil Jin | 10–8 | 55.56% |
| Seiken vs Feng | 10–5 | 66.67% |
| Seiken vs Jun | 11–4 | 73.33% |
| Seiken vs Dragunov | 5–9 | 35.71% |
| Seiken vs Raven | 9–4 | 69.23% |
| Seiken vs Victor | 7–4 | 63.64% |
| Seiken vs Paul | 7–3 | 70.00% |
| Seiken vs Leroy | 5–4 | 55.56% |
| Seiken vs Alisa | 2–6 | 25.00% |
| Seiken vs Shaheen | 5–3 | 62.50% |
| Seiken vs Jack-8 | 6–1 | 85.71% |
| Seiken vs Leo | 2–4 | 33.33% |
| Seiken vs Lars | 0–6 | 0.00% |
| Seiken vs Kuma | 2–4 | 33.33% |
| Seiken vs Zafina | 2–4 | 33.33% |
| Seiken vs Panda | 2–2 | 50.00% |
| Seiken vs Eddy | 0–4 | 0.00% |
| Seiken vs Claudio | 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.