| Headache vs Bryan | 108–129–1 | 45.57% |
| Headache vs Jin | 133–84 | 61.29% |
| Headache vs Steve | 118–69 | 63.10% |
| Headache vs Kazuya | 102–80 | 56.04% |
| Headache vs Hwoarang | 82–80–1 | 50.62% |
| Headache vs Lili | 90–64 | 58.44% |
| Headache vs Devil Jin | 77–75 | 50.66% |
| Headache vs Dragunov | 81–69 | 54.00% |
| Headache vs Yoshimitsu | 78–69 | 53.06% |
| Headache vs Reina | 65–82 | 44.22% |
| Headache vs Heihachi | 80–67 | 54.42% |
| Headache vs King | 64–69 | 48.12% |
| Headache vs Jun | 58–72 | 44.62% |
| Headache vs Law | 62–53 | 53.91% |
| Headache vs Paul | 55–53 | 50.93% |
| Headache vs Lars | 52–53 | 49.52% |
| Headache vs Lee | 52–44 | 54.17% |
| Headache vs Xiaoyu | 50–41 | 54.95% |
| Headache vs Feng | 37–37 | 50.00% |
| Headache vs Azucena | 28–37 | 43.08% |
| Headache vs Leo | 31–32 | 49.21% |
| Headache vs Nina | 31–32 | 49.21% |
| Headache vs Asuka | 31–31 | 50.00% |
| Headache vs Shaheen | 24–37 | 39.34% |
| Headache vs Victor | 26–35 | 42.62% |
| Headache vs Alisa | 26–24 | 52.00% |
| Headache vs Eddy | 26–21 | 55.32% |
| Headache vs Leroy | 20–25 | 44.44% |
| Headache vs Jack-8 | 15–29 | 34.09% |
| Headache vs Zafina | 16–28 | 36.36% |
| Headache vs Claudio | 10–28 | 26.32% |
| Headache vs Kuma | 18–19 | 48.65% |
| Headache vs Raven | 13–18 | 41.94% |
| Headache vs Lidia | 11–11 | 50.00% |
| Headache vs Clive | 4–10 | 28.57% |
| Headache vs Panda | 5–6 | 45.45% |
| Headache vs Anna | 5–5 | 50.00% |
| Headache vs Fahkumram | 5–4 | 55.56% |
| Headache vs Armor King | 3–3 | 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.