| Underheaven vs Kazuya | 22–22 | 50.00% |
| Underheaven vs Hwoarang | 17–13 | 56.67% |
| Underheaven vs Bryan | 11–15 | 42.31% |
| Underheaven vs Steve | 16–7 | 69.57% |
| Underheaven vs Paul | 12–9 | 57.14% |
| Underheaven vs Reina | 15–6 | 71.43% |
| Underheaven vs Lee | 9–10 | 47.37% |
| Underheaven vs Heihachi | 12–7 | 63.16% |
| Underheaven vs King | 10–5 | 66.67% |
| Underheaven vs Lili | 9–6 | 60.00% |
| Underheaven vs Jin | 10–2 | 83.33% |
| Underheaven vs Dragunov | 2–8 | 20.00% |
| Underheaven vs Clive | 5–5 | 50.00% |
| Underheaven vs Nina | 4–5 | 44.44% |
| Underheaven vs Law | 3–3 | 50.00% |
| Underheaven vs Yoshimitsu | 4–2 | 66.67% |
| Underheaven vs Xiaoyu | 4–2 | 66.67% |
| Underheaven vs Claudio | 4–2 | 66.67% |
| Underheaven vs Jun | 4–2 | 66.67% |
| Underheaven vs Lidia | 4–2 | 66.67% |
| Underheaven vs Anna | 5–1 | 83.33% |
| Underheaven vs Asuka | 3–2 | 60.00% |
| Underheaven vs Lars | 2–3 | 40.00% |
| Underheaven vs Zafina | 3–2 | 60.00% |
| Underheaven vs Feng | 2–2 | 50.00% |
| Underheaven vs Raven | 2–2 | 50.00% |
| Underheaven vs Eddy | 2–2 | 50.00% |
| Underheaven vs Jack-8 | 1–2 | 33.33% |
| Underheaven vs Leo | 3–0 | 100.00% |
| Underheaven vs Kuma | 0–3 | 0.00% |
| Underheaven vs Leroy | 2–1 | 66.67% |
| Underheaven vs Devil Jin | 0–2 | 0.00% |
| Underheaven vs Azucena | 0–2 | 0.00% |
| Underheaven vs Panda | 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.