| Isaiah Guevara vs King | 12–19 | 38.71% |
| Isaiah Guevara vs Reina | 9–15 | 37.50% |
| Isaiah Guevara vs Kazuya | 9–11 | 45.00% |
| Isaiah Guevara vs Steve | 9–11 | 45.00% |
| Isaiah Guevara vs Dragunov | 9–11 | 45.00% |
| Isaiah Guevara vs Azucena | 8–11 | 42.11% |
| Isaiah Guevara vs Clive | 6–13 | 31.58% |
| Isaiah Guevara vs Law | 5–9 | 35.71% |
| Isaiah Guevara vs Lili | 5–9 | 35.71% |
| Isaiah Guevara vs Eddy | 7–7 | 50.00% |
| Isaiah Guevara vs Hwoarang | 6–7 | 46.15% |
| Isaiah Guevara vs Bryan | 3–10 | 23.08% |
| Isaiah Guevara vs Jin | 5–7 | 41.67% |
| Isaiah Guevara vs Lee | 3–7 | 30.00% |
| Isaiah Guevara vs Xiaoyu | 4–4 | 50.00% |
| Isaiah Guevara vs Nina | 4–4 | 50.00% |
| Isaiah Guevara vs Kuma | 4–4 | 50.00% |
| Isaiah Guevara vs Leo | 3–4 | 42.86% |
| Isaiah Guevara vs Lars | 3–4 | 42.86% |
| Isaiah Guevara vs Jun | 4–3 | 57.14% |
| Isaiah Guevara vs Victor | 6–1 | 85.71% |
| Isaiah Guevara vs Jack-8 | 2–4 | 33.33% |
| Isaiah Guevara vs Devil Jin | 4–2 | 66.67% |
| Isaiah Guevara vs Alisa | 2–3 | 40.00% |
| Isaiah Guevara vs Claudio | 2–3 | 40.00% |
| Isaiah Guevara vs Leroy | 2–3 | 40.00% |
| Isaiah Guevara vs Paul | 3–1 | 75.00% |
| Isaiah Guevara vs Asuka | 2–2 | 50.00% |
| Isaiah Guevara vs Feng | 1–3 | 25.00% |
| Isaiah Guevara vs Armor King | 2–2 | 50.00% |
| Isaiah Guevara vs Shaheen | 1–2 | 33.33% |
| Isaiah Guevara vs Lidia | 2–1 | 66.67% |
| Isaiah Guevara vs Yoshimitsu | 0–2 | 0.00% |
| Isaiah Guevara vs Panda | 0–2 | 0.00% |
| Isaiah Guevara vs Heihachi | 2–0 | 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.