| Grand Seiko vs Kazuya | 55–34 | 61.80% |
| Grand Seiko vs King | 42–45 | 48.28% |
| Grand Seiko vs Dragunov | 50–30 | 62.50% |
| Grand Seiko vs Paul | 42–36 | 53.85% |
| Grand Seiko vs Hwoarang | 38–38 | 50.00% |
| Grand Seiko vs Steve | 26–24 | 52.00% |
| Grand Seiko vs Asuka | 27–22 | 55.10% |
| Grand Seiko vs Jin | 32–13 | 71.11% |
| Grand Seiko vs Yoshimitsu | 20–20 | 50.00% |
| Grand Seiko vs Bryan | 22–17 | 56.41% |
| Grand Seiko vs Jun | 15–24 | 38.46% |
| Grand Seiko vs Heihachi | 20–19 | 51.28% |
| Grand Seiko vs Alisa | 23–15 | 60.53% |
| Grand Seiko vs Victor | 22–13 | 62.86% |
| Grand Seiko vs Lidia | 13–20 | 39.39% |
| Grand Seiko vs Feng | 25–7 | 78.12% |
| Grand Seiko vs Lars | 19–13 | 59.38% |
| Grand Seiko vs Lee | 14–17 | 45.16% |
| Grand Seiko vs Reina | 14–16 | 46.67% |
| Grand Seiko vs Leo | 16–13 | 55.17% |
| Grand Seiko vs Devil Jin | 18–10 | 64.29% |
| Grand Seiko vs Law | 14–8 | 63.64% |
| Grand Seiko vs Leroy | 8–14 | 36.36% |
| Grand Seiko vs Lili | 8–13 | 38.10% |
| Grand Seiko vs Claudio | 10–10 | 50.00% |
| Grand Seiko vs Shaheen | 8–12 | 40.00% |
| Grand Seiko vs Zafina | 9–9 | 50.00% |
| Grand Seiko vs Xiaoyu | 7–10 | 41.18% |
| Grand Seiko vs Azucena | 10–7 | 58.82% |
| Grand Seiko vs Eddy | 10–6 | 62.50% |
| Grand Seiko vs Jack-8 | 8–6 | 57.14% |
| Grand Seiko vs Raven | 8–6 | 57.14% |
| Grand Seiko vs Nina | 8–5 | 61.54% |
| Grand Seiko vs Kuma | 2–4 | 33.33% |
| Grand Seiko vs Clive | 4–2 | 66.67% |
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.