| Sir Neptune vs Steve | 19–21 | 47.50% |
| Sir Neptune vs Reina | 24–16 | 60.00% |
| Sir Neptune vs Clive | 29–11 | 72.50% |
| Sir Neptune vs Asuka | 17–17 | 50.00% |
| Sir Neptune vs Kazuya | 14–18 | 43.75% |
| Sir Neptune vs Law | 14–14 | 50.00% |
| Sir Neptune vs Hwoarang | 19–7 | 73.08% |
| Sir Neptune vs Lili | 11–14 | 44.00% |
| Sir Neptune vs King | 10–13 | 43.48% |
| Sir Neptune vs Lee | 11–11 | 50.00% |
| Sir Neptune vs Dragunov | 15–6 | 71.43% |
| Sir Neptune vs Bryan | 11–8 | 57.89% |
| Sir Neptune vs Feng | 8–11 | 42.11% |
| Sir Neptune vs Xiaoyu | 11–6 | 64.71% |
| Sir Neptune vs Raven | 11–6 | 64.71% |
| Sir Neptune vs Heihachi | 11–5 | 68.75% |
| Sir Neptune vs Jin | 9–6 | 60.00% |
| Sir Neptune vs Jack-8 | 6–8 | 42.86% |
| Sir Neptune vs Nina | 9–5 | 64.29% |
| Sir Neptune vs Yoshimitsu | 10–3 | 76.92% |
| Sir Neptune vs Jun | 7–5 | 58.33% |
| Sir Neptune vs Leo | 1–9 | 10.00% |
| Sir Neptune vs Leroy | 5–5 | 50.00% |
| Sir Neptune vs Azucena | 5–5 | 50.00% |
| Sir Neptune vs Lidia | 5–4 | 55.56% |
| Sir Neptune vs Kuma | 4–4 | 50.00% |
| Sir Neptune vs Eddy | 4–4 | 50.00% |
| Sir Neptune vs Victor | 1–6 | 14.29% |
| Sir Neptune vs Paul | 1–5 | 16.67% |
| Sir Neptune vs Devil Jin | 2–3 | 40.00% |
| Sir Neptune vs Lars | 2–3 | 40.00% |
| Sir Neptune vs Claudio | 1–4 | 20.00% |
| Sir Neptune vs Alisa | 4–0 | 100.00% |
| Sir Neptune vs Zafina | 4–0 | 100.00% |
| Sir Neptune vs Panda | 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.