| Sai21 vs Kazuya | 111–115 | 49.12% |
| Sai21 vs Jin | 115–110 | 51.11% |
| Sai21 vs Hwoarang | 118–103 | 53.39% |
| Sai21 vs King | 119–80 | 59.80% |
| Sai21 vs Bryan | 88–80 | 52.38% |
| Sai21 vs Paul | 78–82 | 48.75% |
| Sai21 vs Law | 78–78 | 50.00% |
| Sai21 vs Reina | 51–86 | 37.23% |
| Sai21 vs Lili | 61–68 | 47.29% |
| Sai21 vs Steve | 56–56 | 50.00% |
| Sai21 vs Dragunov | 54–50 | 51.92% |
| Sai21 vs Feng | 64–38 | 62.75% |
| Sai21 vs Yoshimitsu | 43–56 | 43.43% |
| Sai21 vs Eddy | 45–42 | 51.72% |
| Sai21 vs Lee | 41–44 | 48.24% |
| Sai21 vs Devil Jin | 43–32 | 57.33% |
| Sai21 vs Asuka | 43–28 | 60.56% |
| Sai21 vs Victor | 29–42 | 40.85% |
| Sai21 vs Xiaoyu | 39–30 | 56.52% |
| Sai21 vs Lars | 30–36 | 45.45% |
| Sai21 vs Nina | 30–36 | 45.45% |
| Sai21 vs Heihachi | 29–37 | 43.94% |
| Sai21 vs Alisa | 32–28 | 53.33% |
| Sai21 vs Jun | 20–38 | 34.48% |
| Sai21 vs Azucena | 24–28 | 46.15% |
| Sai21 vs Anna | 21–30 | 41.18% |
| Sai21 vs Lidia | 19–31 | 38.00% |
| Sai21 vs Claudio | 21–28 | 42.86% |
| Sai21 vs Leroy | 26–23 | 53.06% |
| Sai21 vs Leo | 11–23 | 32.35% |
| Sai21 vs Raven | 11–23 | 32.35% |
| Sai21 vs Jack-8 | 21–10 | 67.74% |
| Sai21 vs Clive | 10–21 | 32.26% |
| Sai21 vs Kuma | 12–15 | 44.44% |
| Sai21 vs Shaheen | 8–15 | 34.78% |
| Sai21 vs Zafina | 12–11 | 52.17% |
| Sai21 vs Fahkumram | 5–11 | 31.25% |
| Sai21 vs Miary Zo | 2–7 | 22.22% |
| Sai21 vs Armor King | 6–2 | 75.00% |
| Sai21 vs Panda | 3–4 | 42.86% |
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.