| iwashi vs Asuka | 6–3 | 66.67% |
| iwashi vs Reina | 4–5 | 44.44% |
| iwashi vs Jin | 7–1 | 87.50% |
| iwashi vs Yoshimitsu | 8–0 | 100.00% |
| iwashi vs Steve | 2–6 | 25.00% |
| iwashi vs Azucena | 3–4 | 42.86% |
| iwashi vs Law | 4–3 | 57.14% |
| iwashi vs Devil Jin | 2–5 | 28.57% |
| iwashi vs Jun | 2–4 | 33.33% |
| iwashi vs King | 4–1 | 80.00% |
| iwashi vs Xiaoyu | 2–2 | 50.00% |
| iwashi vs Paul | 2–1 | 66.67% |
| iwashi vs Lars | 1–2 | 33.33% |
| iwashi vs Shaheen | 2–1 | 66.67% |
| iwashi vs Lee | 1–2 | 33.33% |
| iwashi vs Leroy | 1–2 | 33.33% |
| iwashi vs Kazuya | 2–0 | 100.00% |
| iwashi vs Lili | 0–2 | 0.00% |
| iwashi vs Dragunov | 0–2 | 0.00% |
| iwashi vs Victor | 2–0 | 100.00% |
| iwashi vs Raven | 0–2 | 0.00% |
| iwashi vs Lidia | 2–0 | 100.00% |
| iwashi vs Heihachi | 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.