| Lefty Ruggiero vs Kazuya | 178–178 | 50.00% |
| Lefty Ruggiero vs Jin | 172–148 | 53.75% |
| Lefty Ruggiero vs Bryan | 158–146 | 51.97% |
| Lefty Ruggiero vs Hwoarang | 119–114 | 51.07% |
| Lefty Ruggiero vs King | 136–89 | 60.44% |
| Lefty Ruggiero vs Heihachi | 94–100 | 48.45% |
| Lefty Ruggiero vs Law | 97–92 | 51.32% |
| Lefty Ruggiero vs Paul | 90–97 | 48.13% |
| Lefty Ruggiero vs Lili | 95–71 | 57.23% |
| Lefty Ruggiero vs Reina | 77–80 | 49.04% |
| Lefty Ruggiero vs Dragunov | 88–65 | 57.52% |
| Lefty Ruggiero vs Clive | 57–95 | 37.50% |
| Lefty Ruggiero vs Yoshimitsu | 72–79 | 47.68% |
| Lefty Ruggiero vs Steve | 77–74 | 50.99% |
| Lefty Ruggiero vs Lee | 57–74 | 43.51% |
| Lefty Ruggiero vs Feng | 55–64 | 46.22% |
| Lefty Ruggiero vs Devil Jin | 54–63 | 46.15% |
| Lefty Ruggiero vs Armor King | 54–60 | 47.37% |
| Lefty Ruggiero vs Fahkumram | 53–60 | 46.90% |
| Lefty Ruggiero vs Azucena | 53–58 | 47.75% |
| Lefty Ruggiero vs Jun | 57–52 | 52.29% |
| Lefty Ruggiero vs Lars | 54–42 | 56.25% |
| Lefty Ruggiero vs Nina | 53–36 | 59.55% |
| Lefty Ruggiero vs Eddy | 33–55 | 37.50% |
| Lefty Ruggiero vs Xiaoyu | 41–35 | 53.95% |
| Lefty Ruggiero vs Asuka | 32–44 | 42.11% |
| Lefty Ruggiero vs Leroy | 40–34 | 54.05% |
| Lefty Ruggiero vs Alisa | 33–38 | 46.48% |
| Lefty Ruggiero vs Claudio | 30–38 | 44.12% |
| Lefty Ruggiero vs Raven | 29–37 | 43.94% |
| Lefty Ruggiero vs Leo | 32–30 | 51.61% |
| Lefty Ruggiero vs Lidia | 21–33 | 38.89% |
| Lefty Ruggiero vs Victor | 17–36 | 32.08% |
| Lefty Ruggiero vs Jack-8 | 18–33 | 35.29% |
| Lefty Ruggiero vs Zafina | 17–21 | 44.74% |
| Lefty Ruggiero vs Kuma | 23–13 | 63.89% |
| Lefty Ruggiero vs Anna | 15–20 | 42.86% |
| Lefty Ruggiero vs Shaheen | 12–20 | 37.50% |
| Lefty Ruggiero vs Miary Zo | 11–20 | 35.48% |
| Lefty Ruggiero vs Panda | 6–11 | 35.29% |
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.