| Iakaj8 vs King | 28–19 | 59.57% |
| Iakaj8 vs Lars | 23–23 | 50.00% |
| Iakaj8 vs Jin | 19–23 | 45.24% |
| Iakaj8 vs Law | 18–21 | 46.15% |
| Iakaj8 vs Steve | 21–12 | 63.64% |
| Iakaj8 vs Yoshimitsu | 15–15 | 50.00% |
| Iakaj8 vs Kazuya | 14–15 | 48.28% |
| Iakaj8 vs Lili | 5–19 | 20.83% |
| Iakaj8 vs Dragunov | 14–9 | 60.87% |
| Iakaj8 vs Eddy | 14–9 | 60.87% |
| Iakaj8 vs Hwoarang | 13–9 | 59.09% |
| Iakaj8 vs Xiaoyu | 10–11 | 47.62% |
| Iakaj8 vs Leo | 12–7 | 63.16% |
| Iakaj8 vs Paul | 7–11 | 38.89% |
| Iakaj8 vs Feng | 11–7 | 61.11% |
| Iakaj8 vs Bryan | 10–6 | 62.50% |
| Iakaj8 vs Azucena | 10–5 | 66.67% |
| Iakaj8 vs Lee | 9–4 | 69.23% |
| Iakaj8 vs Nina | 6–6 | 50.00% |
| Iakaj8 vs Kuma | 9–3 | 75.00% |
| Iakaj8 vs Asuka | 10–1 | 90.91% |
| Iakaj8 vs Alisa | 7–4 | 63.64% |
| Iakaj8 vs Reina | 6–5 | 54.55% |
| Iakaj8 vs Claudio | 5–5 | 50.00% |
| Iakaj8 vs Devil Jin | 2–6 | 25.00% |
| Iakaj8 vs Shaheen | 3–4 | 42.86% |
| Iakaj8 vs Zafina | 6–1 | 85.71% |
| Iakaj8 vs Leroy | 3–4 | 42.86% |
| Iakaj8 vs Raven | 4–3 | 57.14% |
| Iakaj8 vs Jack-8 | 4–2 | 66.67% |
| Iakaj8 vs Panda | 4–2 | 66.67% |
| Iakaj8 vs Jun | 3–3 | 50.00% |
| Iakaj8 vs Victor | 2–2 | 50.00% |
| Iakaj8 vs Heihachi | 2–0 | 100.00% |
| Iakaj8 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.