| Costas vs Kazuya | 40–57 | 41.24% |
| Costas vs King | 40–52 | 43.48% |
| Costas vs Jin | 23–47 | 32.86% |
| Costas vs Bryan | 18–33 | 35.29% |
| Costas vs Hwoarang | 17–28 | 37.78% |
| Costas vs Armor King | 21–22 | 48.84% |
| Costas vs Lili | 16–25 | 39.02% |
| Costas vs Paul | 15–25 | 37.50% |
| Costas vs Yoshimitsu | 17–23 | 42.50% |
| Costas vs Law | 9–30 | 23.08% |
| Costas vs Reina | 18–21 | 46.15% |
| Costas vs Heihachi | 17–20 | 45.95% |
| Costas vs Fahkumram | 9–28 | 24.32% |
| Costas vs Xiaoyu | 18–17 | 51.43% |
| Costas vs Steve | 11–20 | 35.48% |
| Costas vs Asuka | 14–17 | 45.16% |
| Costas vs Dragunov | 18–13 | 58.06% |
| Costas vs Eddy | 19–10 | 65.52% |
| Costas vs Feng | 8–17 | 32.00% |
| Costas vs Jun | 17–8 | 68.00% |
| Costas vs Azucena | 13–11 | 54.17% |
| Costas vs Lee | 8–15 | 34.78% |
| Costas vs Leo | 8–14 | 36.36% |
| Costas vs Lars | 14–8 | 63.64% |
| Costas vs Anna | 5–15 | 25.00% |
| Costas vs Devil Jin | 6–13 | 31.58% |
| Costas vs Victor | 12–5 | 70.59% |
| Costas vs Clive | 9–8 | 52.94% |
| Costas vs Lidia | 10–5 | 66.67% |
| Costas vs Leroy | 6–8 | 42.86% |
| Costas vs Claudio | 7–4 | 63.64% |
| Costas vs Jack-8 | 4–6 | 40.00% |
| Costas vs Alisa | 7–2 | 77.78% |
| Costas vs Nina | 4–5 | 44.44% |
| Costas vs Zafina | 5–4 | 55.56% |
| Costas vs Raven | 3–4 | 42.86% |
| Costas vs Shaheen | 1–4 | 20.00% |
| Costas vs Kuma | 1–2 | 33.33% |
| Costas 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.