| Costello vs Reina | 18–24 | 42.86% |
| Costello vs Steve | 18–23 | 43.90% |
| Costello vs Kazuya | 16–24 | 40.00% |
| Costello vs Lili | 13–23 | 36.11% |
| Costello vs Clive | 11–24 | 31.43% |
| Costello vs King | 13–20 | 39.39% |
| Costello vs Paul | 11–21 | 34.38% |
| Costello vs Hwoarang | 16–15 | 51.61% |
| Costello vs Jun | 10–20 | 33.33% |
| Costello vs Heihachi | 10–19 | 34.48% |
| Costello vs Dragunov | 12–14 | 46.15% |
| Costello vs Jin | 9–15 | 37.50% |
| Costello vs Victor | 10–14 | 41.67% |
| Costello vs Xiaoyu | 8–14 | 36.36% |
| Costello vs Jack-8 | 7–15 | 31.82% |
| Costello vs Yoshimitsu | 6–9 | 40.00% |
| Costello vs Bryan | 6–8 | 42.86% |
| Costello vs Leroy | 5–9 | 35.71% |
| Costello vs Asuka | 3–9 | 25.00% |
| Costello vs Eddy | 6–6 | 50.00% |
| Costello vs Devil Jin | 2–9 | 18.18% |
| Costello vs Leo | 3–8 | 27.27% |
| Costello vs Lidia | 2–9 | 18.18% |
| Costello vs Kuma | 1–9 | 10.00% |
| Costello vs Azucena | 7–3 | 70.00% |
| Costello vs Anna | 5–5 | 50.00% |
| Costello vs Law | 2–7 | 22.22% |
| Costello vs Lars | 2–5 | 28.57% |
| Costello vs Lee | 1–6 | 14.29% |
| Costello vs Panda | 1–6 | 14.29% |
| Costello vs Feng | 2–4 | 33.33% |
| Costello vs Alisa | 0–6 | 0.00% |
| Costello vs Nina | 2–4 | 33.33% |
| Costello vs Claudio | 2–2 | 50.00% |
| Costello vs Shaheen | 2–2 | 50.00% |
| Costello vs Zafina | 1–2 | 33.33% |
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.