| Siewca vs Jin | 37–35 | 51.39% |
| Siewca vs Kazuya | 43–25 | 63.24% |
| Siewca vs Bryan | 34–32 | 51.52% |
| Siewca vs King | 31–22 | 58.49% |
| Siewca vs Fahkumram | 28–23 | 54.90% |
| Siewca vs Steve | 21–26 | 44.68% |
| Siewca vs Hwoarang | 21–23 | 47.73% |
| Siewca vs Yoshimitsu | 15–23 | 39.47% |
| Siewca vs Law | 17–19 | 47.22% |
| Siewca vs Dragunov | 17–19 | 47.22% |
| Siewca vs Reina | 14–12 | 53.85% |
| Siewca vs Anna | 10–16 | 38.46% |
| Siewca vs Heihachi | 11–14 | 44.00% |
| Siewca vs Jun | 12–9 | 57.14% |
| Siewca vs Devil Jin | 5–15 | 25.00% |
| Siewca vs Lee | 12–8 | 60.00% |
| Siewca vs Lili | 13–6 | 68.42% |
| Siewca vs Azucena | 10–9 | 52.63% |
| Siewca vs Lars | 3–15 | 16.67% |
| Siewca vs Paul | 7–10 | 41.18% |
| Siewca vs Alisa | 9–8 | 52.94% |
| Siewca vs Lidia | 6–10 | 37.50% |
| Siewca vs Asuka | 9–6 | 60.00% |
| Siewca vs Nina | 8–7 | 53.33% |
| Siewca vs Clive | 4–11 | 26.67% |
| Siewca vs Feng | 4–8 | 33.33% |
| Siewca vs Eddy | 4–8 | 33.33% |
| Siewca vs Xiaoyu | 5–3 | 62.50% |
| Siewca vs Leo | 8–0 | 100.00% |
| Siewca vs Claudio | 1–6 | 14.29% |
| Siewca vs Victor | 2–5 | 28.57% |
| Siewca vs Raven | 6–1 | 85.71% |
| Siewca vs Armor King | 4–3 | 57.14% |
| Siewca vs Panda | 1–4 | 20.00% |
| Siewca vs Shaheen | 2–2 | 50.00% |
| Siewca vs Jack-8 | 1–1 | 50.00% |
| Siewca vs Zafina | 2–0 | 100.00% |
| Siewca vs Leroy | 2–0 | 100.00% |
| Siewca vs Miary Zo | 0–2 | 0.00% |
| Siewca vs Kuma | 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.