| Heffay vs Steve | 10–4 | 71.43% |
| Heffay vs Kazuya | 4–3 | 57.14% |
| Heffay vs Dragunov | 3–4 | 42.86% |
| Heffay vs Heihachi | 2–5 | 28.57% |
| Heffay vs Clive | 1–6 | 14.29% |
| Heffay vs King | 1–5 | 16.67% |
| Heffay vs Jin | 0–6 | 0.00% |
| Heffay vs Jack-8 | 4–2 | 66.67% |
| Heffay vs Lili | 0–6 | 0.00% |
| Heffay vs Armor King | 3–3 | 50.00% |
| Heffay vs Bryan | 0–5 | 0.00% |
| Heffay vs Zafina | 4–1 | 80.00% |
| Heffay vs Hwoarang | 0–4 | 0.00% |
| Heffay vs Jun | 3–1 | 75.00% |
| Heffay vs Victor | 2–2 | 50.00% |
| Heffay vs Law | 2–1 | 66.67% |
| Heffay vs Yoshimitsu | 0–3 | 0.00% |
| Heffay vs Leo | 2–1 | 66.67% |
| Heffay vs Alisa | 1–2 | 33.33% |
| Heffay vs Azucena | 2–1 | 66.67% |
| Heffay vs Lidia | 2–1 | 66.67% |
| Heffay vs Fahkumram | 2–1 | 66.67% |
| Heffay vs Feng | 2–0 | 100.00% |
| Heffay vs Lars | 0–2 | 0.00% |
| Heffay vs Leroy | 2–0 | 100.00% |
| Heffay vs Reina | 2–0 | 100.00% |
| Heffay vs Eddy | 1–1 | 50.00% |
| Heffay vs Anna | 2–0 | 100.00% |
| Heffay vs Asuka | 1–0 | 100.00% |
| Heffay vs Nina | 0–1 | 0.00% |
| Heffay vs Panda | 0–1 | 0.00% |
| Heffay 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.