| Ionesco vs Jin | 11–12 | 47.83% |
| Ionesco vs King | 11–10 | 52.38% |
| Ionesco vs Fahkumram | 7–13 | 35.00% |
| Ionesco vs Steve | 15–4 | 78.95% |
| Ionesco vs Law | 9–8 | 52.94% |
| Ionesco vs Lili | 9–8 | 52.94% |
| Ionesco vs Hwoarang | 6–10 | 37.50% |
| Ionesco vs Clive | 5–10 | 33.33% |
| Ionesco vs Heihachi | 7–7 | 50.00% |
| Ionesco vs Kazuya | 1–10 | 9.09% |
| Ionesco vs Nina | 7–4 | 63.64% |
| Ionesco vs Armor King | 1–10 | 9.09% |
| Ionesco vs Xiaoyu | 7–3 | 70.00% |
| Ionesco vs Devil Jin | 5–5 | 50.00% |
| Ionesco vs Paul | 5–4 | 55.56% |
| Ionesco vs Lars | 5–4 | 55.56% |
| Ionesco vs Reina | 5–4 | 55.56% |
| Ionesco vs Eddy | 6–3 | 66.67% |
| Ionesco vs Jack-8 | 4–4 | 50.00% |
| Ionesco vs Dragunov | 4–4 | 50.00% |
| Ionesco vs Yoshimitsu | 7–0 | 100.00% |
| Ionesco vs Bryan | 4–3 | 57.14% |
| Ionesco vs Asuka | 5–2 | 71.43% |
| Ionesco vs Azucena | 6–1 | 85.71% |
| Ionesco vs Lee | 4–1 | 80.00% |
| Ionesco vs Leroy | 3–2 | 60.00% |
| Ionesco vs Victor | 1–4 | 20.00% |
| Ionesco vs Raven | 3–2 | 60.00% |
| Ionesco vs Lidia | 1–4 | 20.00% |
| Ionesco vs Feng | 1–3 | 25.00% |
| Ionesco vs Jun | 2–2 | 50.00% |
| Ionesco vs Anna | 3–1 | 75.00% |
| Ionesco vs Zafina | 2–1 | 66.67% |
| Ionesco vs Alisa | 2–0 | 100.00% |
| Ionesco vs Shaheen | 2–0 | 100.00% |
| Ionesco vs Claudio | 0–1 | 0.00% |
| Ionesco vs Miary Zo | 0–1 | 0.00% |
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.