| Iwatani vs King | 131–107 | 55.04% |
| Iwatani vs Kazuya | 114–121 | 48.51% |
| Iwatani vs Jin | 108–110 | 49.54% |
| Iwatani vs Law | 77–107 | 41.85% |
| Iwatani vs Steve | 87–91 | 48.88% |
| Iwatani vs Reina | 75–101 | 42.61% |
| Iwatani vs Bryan | 91–71 | 56.17% |
| Iwatani vs Yoshimitsu | 93–61–1 | 60.39% |
| Iwatani vs Armor King | 60–94 | 38.96% |
| Iwatani vs Dragunov | 71–59 | 54.62% |
| Iwatani vs Jun | 60–68 | 46.88% |
| Iwatani vs Fahkumram | 48–64 | 42.86% |
| Iwatani vs Heihachi | 33–73 | 31.13% |
| Iwatani vs Hwoarang | 47–58 | 44.76% |
| Iwatani vs Lars | 50–55 | 47.62% |
| Iwatani vs Lili | 46–58 | 44.23% |
| Iwatani vs Lee | 43–61 | 41.35% |
| Iwatani vs Asuka | 54–49 | 52.43% |
| Iwatani vs Paul | 50–43 | 53.76% |
| Iwatani vs Eddy | 33–59 | 35.87% |
| Iwatani vs Azucena | 32–57 | 35.96% |
| Iwatani vs Feng | 40–44 | 47.62% |
| Iwatani vs Victor | 39–42 | 48.15% |
| Iwatani vs Xiaoyu | 41–37 | 52.56% |
| Iwatani vs Miary Zo | 27–46 | 36.99% |
| Iwatani vs Devil Jin | 27–43 | 38.57% |
| Iwatani vs Nina | 38–29 | 56.72% |
| Iwatani vs Alisa | 27–35 | 43.55% |
| Iwatani vs Leroy | 35–27 | 56.45% |
| Iwatani vs Raven | 30–31 | 49.18% |
| Iwatani vs Jack-8 | 28–29 | 49.12% |
| Iwatani vs Lidia | 22–33 | 40.00% |
| Iwatani vs Leo | 33–19 | 63.46% |
| Iwatani vs Zafina | 37–13 | 74.00% |
| Iwatani vs Clive | 15–34 | 30.61% |
| Iwatani vs Claudio | 12–29 | 29.27% |
| Iwatani vs Kuma | 16–22 | 42.11% |
| Iwatani vs Shaheen | 14–23 | 37.84% |
| Iwatani vs Anna | 14–4 | 77.78% |
| Iwatani vs Panda | 5–5 | 50.00% |
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.