| Siyeon vs Kazuya | 40–45 | 47.06% |
| Siyeon vs Heihachi | 39–46 | 45.88% |
| Siyeon vs Reina | 43–37 | 53.75% |
| Siyeon vs Dragunov | 35–41 | 46.05% |
| Siyeon vs Hwoarang | 40–31 | 56.34% |
| Siyeon vs Jun | 39–29 | 57.35% |
| Siyeon vs Lili | 36–31 | 53.73% |
| Siyeon vs Victor | 29–35 | 45.31% |
| Siyeon vs Paul | 25–35 | 41.67% |
| Siyeon vs Steve | 32–27 | 54.24% |
| Siyeon vs Jin | 26–28 | 48.15% |
| Siyeon vs Yoshimitsu | 25–27 | 48.08% |
| Siyeon vs King | 15–30 | 33.33% |
| Siyeon vs Eddy | 22–21 | 51.16% |
| Siyeon vs Bryan | 17–24 | 41.46% |
| Siyeon vs Alisa | 15–22 | 40.54% |
| Siyeon vs Nina | 14–23 | 37.84% |
| Siyeon vs Asuka | 20–16 | 55.56% |
| Siyeon vs Devil Jin | 14–18 | 43.75% |
| Siyeon vs Jack-8 | 10–21 | 32.26% |
| Siyeon vs Claudio | 10–21 | 32.26% |
| Siyeon vs Law | 15–15 | 50.00% |
| Siyeon vs Lidia | 12–17 | 41.38% |
| Siyeon vs Leroy | 13–12 | 52.00% |
| Siyeon vs Leo | 6–18 | 25.00% |
| Siyeon vs Clive | 7–17 | 29.17% |
| Siyeon vs Xiaoyu | 8–14 | 36.36% |
| Siyeon vs Feng | 7–11 | 38.89% |
| Siyeon vs Lars | 9–7 | 56.25% |
| Siyeon vs Shaheen | 6–6 | 50.00% |
| Siyeon vs Anna | 6–6 | 50.00% |
| Siyeon vs Lee | 5–6 | 45.45% |
| Siyeon vs Raven | 5–6 | 45.45% |
| Siyeon vs Armor King | 6–5 | 54.55% |
| Siyeon vs Kuma | 4–6 | 40.00% |
| Siyeon vs Zafina | 6–4 | 60.00% |
| Siyeon vs Miary Zo | 6–4 | 60.00% |
| Siyeon vs Panda | 6–0 | 100.00% |
| Siyeon vs Azucena | 3–3 | 50.00% |
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.