| Portessa vs King | 56–95 | 37.09% |
| Portessa vs Jin | 56–94 | 37.33% |
| Portessa vs Kazuya | 49–73 | 40.16% |
| Portessa vs Reina | 39–56 | 41.05% |
| Portessa vs Law | 33–59 | 35.87% |
| Portessa vs Hwoarang | 31–55 | 36.05% |
| Portessa vs Bryan | 49–37 | 56.98% |
| Portessa vs Steve | 33–42 | 44.00% |
| Portessa vs Eddy | 28–40 | 41.18% |
| Portessa vs Dragunov | 22–43 | 33.85% |
| Portessa vs Heihachi | 28–36 | 43.75% |
| Portessa vs Devil Jin | 22–33 | 40.00% |
| Portessa vs Nina | 21–32 | 39.62% |
| Portessa vs Yoshimitsu | 22–26 | 45.83% |
| Portessa vs Alisa | 19–26 | 42.22% |
| Portessa vs Paul | 16–28 | 36.36% |
| Portessa vs Lars | 18–26 | 40.91% |
| Portessa vs Azucena | 21–22 | 48.84% |
| Portessa vs Lidia | 14–27 | 34.15% |
| Portessa vs Lili | 26–14 | 65.00% |
| Portessa vs Xiaoyu | 19–20 | 48.72% |
| Portessa vs Jun | 19–20 | 48.72% |
| Portessa vs Asuka | 21–17 | 55.26% |
| Portessa vs Clive | 18–20 | 47.37% |
| Portessa vs Anna | 21–15 | 58.33% |
| Portessa vs Claudio | 12–23 | 34.29% |
| Portessa vs Lee | 9–23 | 28.12% |
| Portessa vs Victor | 7–24 | 22.58% |
| Portessa vs Fahkumram | 9–12 | 42.86% |
| Portessa vs Leo | 8–12 | 40.00% |
| Portessa vs Leroy | 8–11 | 42.11% |
| Portessa vs Jack-8 | 7–10 | 41.18% |
| Portessa vs Shaheen | 8–9 | 47.06% |
| Portessa vs Feng | 11–4 | 73.33% |
| Portessa vs Kuma | 3–11 | 21.43% |
| Portessa vs Raven | 5–6 | 45.45% |
| Portessa vs Zafina | 4–5 | 44.44% |
| Portessa vs Panda | 3–3 | 50.00% |
| Portessa vs Armor King | 0–6 | 0.00% |
| Portessa vs Miary Zo | 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.