| Iwakura vs King | 144–155 | 48.16% |
| Iwakura vs Jin | 141–158 | 47.16% |
| Iwakura vs Kazuya | 137–134 | 50.55% |
| Iwakura vs Reina | 112–99 | 53.08% |
| Iwakura vs Bryan | 106–85 | 55.50% |
| Iwakura vs Yoshimitsu | 105–79 | 57.07% |
| Iwakura vs Steve | 75–103 | 42.13% |
| Iwakura vs Lili | 77–99 | 43.75% |
| Iwakura vs Heihachi | 83–90 | 47.98% |
| Iwakura vs Hwoarang | 77–86 | 47.24% |
| Iwakura vs Law | 66–81 | 44.90% |
| Iwakura vs Dragunov | 60–73 | 45.11% |
| Iwakura vs Azucena | 50–75 | 40.00% |
| Iwakura vs Lee | 55–66 | 45.45% |
| Iwakura vs Clive | 57–60 | 48.72% |
| Iwakura vs Asuka | 58–54 | 51.79% |
| Iwakura vs Paul | 59–48 | 55.14% |
| Iwakura vs Devil Jin | 49–47 | 51.04% |
| Iwakura vs Jun | 38–58 | 39.58% |
| Iwakura vs Feng | 30–63 | 32.26% |
| Iwakura vs Xiaoyu | 40–37 | 51.95% |
| Iwakura vs Nina | 37–40 | 48.05% |
| Iwakura vs Eddy | 20–52 | 27.78% |
| Iwakura vs Leroy | 23–44 | 34.33% |
| Iwakura vs Jack-8 | 34–32 | 51.52% |
| Iwakura vs Alisa | 32–30 | 51.61% |
| Iwakura vs Victor | 26–35 | 42.62% |
| Iwakura vs Lidia | 26–34 | 43.33% |
| Iwakura vs Shaheen | 19–37 | 33.93% |
| Iwakura vs Lars | 21–34 | 38.18% |
| Iwakura vs Kuma | 29–26 | 52.73% |
| Iwakura vs Armor King | 17–29 | 36.96% |
| Iwakura vs Claudio | 21–22 | 48.84% |
| Iwakura vs Leo | 18–22 | 45.00% |
| Iwakura vs Zafina | 13–27 | 32.50% |
| Iwakura vs Raven | 15–20 | 42.86% |
| Iwakura vs Panda | 14–15 | 48.28% |
| Iwakura vs Anna | 6–6 | 50.00% |
| Iwakura vs Fahkumram | 1–5 | 16.67% |
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.