| Undie_Grundy vs Reina | 4–1 | 80.00% |
| Undie_Grundy vs Feng | 1–2 | 33.33% |
| Undie_Grundy vs Dragunov | 1–2 | 33.33% |
| Undie_Grundy vs Clive | 1–1 | 50.00% |
| Undie_Grundy vs Law | 1–0 | 100.00% |
| Undie_Grundy vs King | 1–0 | 100.00% |
| Undie_Grundy vs Jin | 0–1 | 0.00% |
| Undie_Grundy vs Leo | 1–0 | 100.00% |
| Undie_Grundy vs Raven | 1–0 | 100.00% |
| Undie_Grundy vs Eddy | 0–1 | 0.00% |
| Undie_Grundy vs Lidia | 1–0 | 100.00% |
| Undie_Grundy 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.