| Islaya vs King | 14–13 | 51.85% |
| Islaya vs Asuka | 7–6 | 53.85% |
| Islaya vs Steve | 5–6 | 45.45% |
| Islaya vs Law | 7–2 | 77.78% |
| Islaya vs Hwoarang | 5–4 | 55.56% |
| Islaya vs Kazuya | 6–3 | 66.67% |
| Islaya vs Nina | 4–4 | 50.00% |
| Islaya vs Reina | 5–3 | 62.50% |
| Islaya vs Lili | 6–1 | 85.71% |
| Islaya vs Raven | 3–4 | 42.86% |
| Islaya vs Claudio | 2–4 | 33.33% |
| Islaya vs Jin | 1–4 | 20.00% |
| Islaya vs Bryan | 5–0 | 100.00% |
| Islaya vs Eddy | 4–1 | 80.00% |
| Islaya vs Leroy | 3–1 | 75.00% |
| Islaya vs Anna | 1–3 | 25.00% |
| Islaya vs Paul | 3–0 | 100.00% |
| Islaya vs Xiaoyu | 3–0 | 100.00% |
| Islaya vs Jack-8 | 0–3 | 0.00% |
| Islaya vs Feng | 0–3 | 0.00% |
| Islaya vs Dragunov | 3–0 | 100.00% |
| Islaya vs Lee | 1–2 | 33.33% |
| Islaya vs Devil Jin | 0–2 | 0.00% |
| Islaya vs Alisa | 2–0 | 100.00% |
| Islaya vs Heihachi | 1–1 | 50.00% |
| Islaya vs Clive | 0–2 | 0.00% |
| Islaya vs Lars | 1–0 | 100.00% |
| Islaya vs Zafina | 1–0 | 100.00% |
| Islaya vs Jun | 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.