| KASSADIN vs Kazuya | 132–80 | 62.26% |
| KASSADIN vs Bryan | 106–97 | 52.22% |
| KASSADIN vs King | 82–71 | 53.59% |
| KASSADIN vs Jin | 67–60 | 52.76% |
| KASSADIN vs Hwoarang | 45–64 | 41.28% |
| KASSADIN vs Lili | 53–51 | 50.96% |
| KASSADIN vs Reina | 54–50 | 51.92% |
| KASSADIN vs Dragunov | 62–40 | 60.78% |
| KASSADIN vs Lidia | 45–47 | 48.91% |
| KASSADIN vs Steve | 43–43 | 50.00% |
| KASSADIN vs Lee | 50–31 | 61.73% |
| KASSADIN vs Azucena | 31–37 | 45.59% |
| KASSADIN vs Law | 31–36 | 46.27% |
| KASSADIN vs Yoshimitsu | 23–44 | 34.33% |
| KASSADIN vs Devil Jin | 38–28 | 57.58% |
| KASSADIN vs Lars | 35–30 | 53.85% |
| KASSADIN vs Jun | 28–35 | 44.44% |
| KASSADIN vs Asuka | 31–29 | 51.67% |
| KASSADIN vs Xiaoyu | 32–27 | 54.24% |
| KASSADIN vs Paul | 35–23 | 60.34% |
| KASSADIN vs Victor | 27–21 | 56.25% |
| KASSADIN vs Leo | 24–23 | 51.06% |
| KASSADIN vs Claudio | 21–26 | 44.68% |
| KASSADIN vs Clive | 18–29 | 38.30% |
| KASSADIN vs Raven | 21–21 | 50.00% |
| KASSADIN vs Eddy | 12–30 | 28.57% |
| KASSADIN vs Feng | 21–20 | 51.22% |
| KASSADIN vs Nina | 14–25 | 35.90% |
| KASSADIN vs Armor King | 13–25 | 34.21% |
| KASSADIN vs Jack-8 | 18–18 | 50.00% |
| KASSADIN vs Heihachi | 24–10 | 70.59% |
| KASSADIN vs Zafina | 17–13 | 56.67% |
| KASSADIN vs Leroy | 16–14 | 53.33% |
| KASSADIN vs Alisa | 9–20 | 31.03% |
| KASSADIN vs Kuma | 13–16 | 44.83% |
| KASSADIN vs Fahkumram | 11–18 | 37.93% |
| KASSADIN vs Anna | 13–15 | 46.43% |
| KASSADIN vs Shaheen | 7–17 | 29.17% |
| KASSADIN vs Panda | 8–10 | 44.44% |
| KASSADIN vs Miary Zo | 7–9 | 43.75% |
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.