| João Santos vs Hwoarang | 5–10 | 33.33% |
| João Santos vs Jin | 6–9 | 40.00% |
| João Santos vs Kazuya | 1–11 | 8.33% |
| João Santos vs Bryan | 2–9 | 18.18% |
| João Santos vs King | 5–5 | 50.00% |
| João Santos vs Fahkumram | 3–7 | 30.00% |
| João Santos vs Steve | 0–9 | 0.00% |
| João Santos vs Law | 2–6 | 25.00% |
| João Santos vs Lili | 2–6 | 25.00% |
| João Santos vs Yoshimitsu | 1–5 | 16.67% |
| João Santos vs Dragunov | 1–4 | 20.00% |
| João Santos vs Alisa | 0–5 | 0.00% |
| João Santos vs Lee | 3–2 | 60.00% |
| João Santos vs Kuma | 2–3 | 40.00% |
| João Santos vs Eddy | 1–4 | 20.00% |
| João Santos vs Reina | 3–1 | 75.00% |
| João Santos vs Claudio | 0–3 | 0.00% |
| João Santos vs Victor | 2–1 | 66.67% |
| João Santos vs Heihachi | 1–2 | 33.33% |
| João Santos vs Asuka | 0–2 | 0.00% |
| João Santos vs Shaheen | 0–2 | 0.00% |
| João Santos vs Raven | 0–2 | 0.00% |
| João Santos vs Jack-8 | 0–1 | 0.00% |
| João Santos vs Devil Jin | 1–0 | 100.00% |
| João Santos vs Feng | 0–1 | 0.00% |
| João Santos vs Leo | 1–0 | 100.00% |
| João Santos vs Lars | 0–1 | 0.00% |
| João Santos vs Nina | 0–1 | 0.00% |
| João Santos vs Panda | 0–1 | 0.00% |
| João Santos vs Zafina | 1–0 | 100.00% |
| João Santos vs Leroy | 0–1 | 0.00% |
| João Santos vs Azucena | 0–1 | 0.00% |
| João Santos vs Lidia | 0–1 | 0.00% |
| João Santos vs Clive | 1–0 | 100.00% |
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.