| Heffay vs King | 14–23 | 37.84% |
| Heffay vs Steve | 22–13 | 62.86% |
| Heffay vs Kazuya | 10–15 | 40.00% |
| Heffay vs Jin | 2–20 | 9.09% |
| Heffay vs Lee | 10–6 | 62.50% |
| Heffay vs Armor King | 4–12 | 25.00% |
| Heffay vs Hwoarang | 5–9 | 35.71% |
| Heffay vs Dragunov | 5–9 | 35.71% |
| Heffay vs Jun | 4–10 | 28.57% |
| Heffay vs Reina | 10–3 | 76.92% |
| Heffay vs Azucena | 8–5 | 61.54% |
| Heffay vs Victor | 4–9 | 30.77% |
| Heffay vs Fahkumram | 4–9 | 30.77% |
| Heffay vs Lili | 1–11 | 8.33% |
| Heffay vs Bryan | 2–9 | 18.18% |
| Heffay vs Heihachi | 2–9 | 18.18% |
| Heffay vs Jack-8 | 5–4 | 55.56% |
| Heffay vs Leo | 5–4 | 55.56% |
| Heffay vs Shaheen | 7–2 | 77.78% |
| Heffay vs Kuma | 3–6 | 33.33% |
| Heffay vs Lidia | 6–3 | 66.67% |
| Heffay vs Clive | 1–8 | 11.11% |
| Heffay vs Law | 2–6 | 25.00% |
| Heffay vs Yoshimitsu | 1–7 | 12.50% |
| Heffay vs Asuka | 4–4 | 50.00% |
| Heffay vs Alisa | 2–6 | 25.00% |
| Heffay vs Eddy | 1–5 | 16.67% |
| Heffay vs Nina | 3–2 | 60.00% |
| Heffay vs Zafina | 4–1 | 80.00% |
| Heffay vs Miary Zo | 0–5 | 0.00% |
| Heffay vs Claudio | 2–2 | 50.00% |
| Heffay vs Panda | 2–2 | 50.00% |
| Heffay vs Xiaoyu | 1–2 | 33.33% |
| Heffay vs Leroy | 2–1 | 66.67% |
| Heffay vs Devil Jin | 2–0 | 100.00% |
| Heffay vs Feng | 2–0 | 100.00% |
| Heffay vs Lars | 0–2 | 0.00% |
| Heffay vs Anna | 2–0 | 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.