| Sam Siwaphas vs Reina | 3–12 | 20.00% |
| Sam Siwaphas vs Victor | 4–9 | 30.77% |
| Sam Siwaphas vs King | 3–8 | 27.27% |
| Sam Siwaphas vs Jin | 0–9 | 0.00% |
| Sam Siwaphas vs Steve | 0–8 | 0.00% |
| Sam Siwaphas vs Devil Jin | 3–5 | 37.50% |
| Sam Siwaphas vs Clive | 0–8 | 0.00% |
| Sam Siwaphas vs Asuka | 1–6 | 14.29% |
| Sam Siwaphas vs Raven | 1–3 | 25.00% |
| Sam Siwaphas vs Law | 2–1 | 66.67% |
| Sam Siwaphas vs Kazuya | 0–3 | 0.00% |
| Sam Siwaphas vs Panda | 1–2 | 33.33% |
| Sam Siwaphas vs Paul | 0–2 | 0.00% |
| Sam Siwaphas vs Hwoarang | 0–2 | 0.00% |
| Sam Siwaphas vs Xiaoyu | 1–1 | 50.00% |
| Sam Siwaphas vs Lili | 2–0 | 100.00% |
| Sam Siwaphas vs Claudio | 0–2 | 0.00% |
| Sam Siwaphas vs Jun | 0–2 | 0.00% |
| Sam Siwaphas vs Eddy | 0–2 | 0.00% |
| Sam Siwaphas vs Fahkumram | 0–2 | 0.00% |
| Sam Siwaphas vs Yoshimitsu | 0–1 | 0.00% |
| Sam Siwaphas vs Lee | 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.