| K_Wil21 vs Hwoarang | 188–152 | 55.29% |
| K_Wil21 vs Kazuya | 186–153 | 54.87% |
| K_Wil21 vs Steve | 162–136 | 54.36% |
| K_Wil21 vs Jin | 165–124 | 57.09% |
| K_Wil21 vs Bryan | 178–105–1 | 62.90% |
| K_Wil21 vs King | 149–129 | 53.60% |
| K_Wil21 vs Reina | 174–101 | 63.27% |
| K_Wil21 vs Law | 132–123 | 51.76% |
| K_Wil21 vs Dragunov | 125–115 | 52.08% |
| K_Wil21 vs Yoshimitsu | 119–120 | 49.79% |
| K_Wil21 vs Lee | 119–100 | 54.34% |
| K_Wil21 vs Paul | 115–98 | 53.99% |
| K_Wil21 vs Lidia | 99–110 | 47.37% |
| K_Wil21 vs Lili | 104–87 | 54.45% |
| K_Wil21 vs Heihachi | 82–87 | 48.52% |
| K_Wil21 vs Asuka | 94–74 | 55.95% |
| K_Wil21 vs Jun | 82–71 | 53.59% |
| K_Wil21 vs Leo | 80–72 | 52.63% |
| K_Wil21 vs Feng | 74–73 | 50.34% |
| K_Wil21 vs Nina | 74–71 | 51.03% |
| K_Wil21 vs Lars | 76–67 | 53.15% |
| K_Wil21 vs Devil Jin | 81–60 | 57.45% |
| K_Wil21 vs Azucena | 79–60 | 56.83% |
| K_Wil21 vs Victor | 77–59 | 56.62% |
| K_Wil21 vs Eddy | 82–43 | 65.60% |
| K_Wil21 vs Raven | 55–69 | 44.35% |
| K_Wil21 vs Jack-8 | 53–66 | 44.54% |
| K_Wil21 vs Xiaoyu | 57–55 | 50.89% |
| K_Wil21 vs Zafina | 53–58 | 47.75% |
| K_Wil21 vs Leroy | 44–50 | 46.81% |
| K_Wil21 vs Alisa | 41–52 | 44.09% |
| K_Wil21 vs Claudio | 45–38 | 54.22% |
| K_Wil21 vs Kuma | 32–31 | 50.79% |
| K_Wil21 vs Shaheen | 30–30 | 50.00% |
| K_Wil21 vs Clive | 15–22 | 40.54% |
| K_Wil21 vs Panda | 15–17 | 46.88% |
| K_Wil21 vs Armor King | 14–6 | 70.00% |
| K_Wil21 vs Fahkumram | 4–4 | 50.00% |
| K_Wil21 vs Anna | 3–0 | 100.00% |
| K_Wil21 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.