| Billy Ka vs Eddy | 21–40 | 34.43% |
| Billy Ka vs Hwoarang | 22–26 | 45.83% |
| Billy Ka vs Law | 22–19 | 53.66% |
| Billy Ka vs Jin | 15–26 | 36.59% |
| Billy Ka vs Kazuya | 20–21 | 48.78% |
| Billy Ka vs King | 11–15 | 42.31% |
| Billy Ka vs Victor | 15–11 | 57.69% |
| Billy Ka vs Paul | 12–12 | 50.00% |
| Billy Ka vs Lili | 15–9 | 62.50% |
| Billy Ka vs Steve | 11–11 | 50.00% |
| Billy Ka vs Reina | 14–8 | 63.64% |
| Billy Ka vs Yoshimitsu | 7–14 | 33.33% |
| Billy Ka vs Alisa | 4–16 | 20.00% |
| Billy Ka vs Bryan | 6–11 | 35.29% |
| Billy Ka vs Jun | 12–5 | 70.59% |
| Billy Ka vs Azucena | 10–7 | 58.82% |
| Billy Ka vs Dragunov | 2–14 | 12.50% |
| Billy Ka vs Lidia | 7–9 | 43.75% |
| Billy Ka vs Lee | 5–9 | 35.71% |
| Billy Ka vs Devil Jin | 4–8 | 33.33% |
| Billy Ka vs Zafina | 6–6 | 50.00% |
| Billy Ka vs Asuka | 5–5 | 50.00% |
| Billy Ka vs Leroy | 5–5 | 50.00% |
| Billy Ka vs Anna | 2–8 | 20.00% |
| Billy Ka vs Heihachi | 4–5 | 44.44% |
| Billy Ka vs Xiaoyu | 4–3 | 57.14% |
| Billy Ka vs Feng | 4–3 | 57.14% |
| Billy Ka vs Lars | 4–3 | 57.14% |
| Billy Ka vs Clive | 3–4 | 42.86% |
| Billy Ka vs Armor King | 4–3 | 57.14% |
| Billy Ka vs Fahkumram | 4–2 | 66.67% |
| Billy Ka vs Shaheen | 3–2 | 60.00% |
| Billy Ka vs Jack-8 | 2–2 | 50.00% |
| Billy Ka vs Nina | 0–3 | 0.00% |
| Billy Ka vs Kuma | 0–3 | 0.00% |
| Billy Ka vs Leo | 2–0 | 100.00% |
| Billy Ka vs Claudio | 0–2 | 0.00% |
| Billy Ka vs Raven | 1–0 | 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.