| Kay Mahgee vs Steve | 13–17 | 43.33% |
| Kay Mahgee vs Jin | 10–15 | 40.00% |
| Kay Mahgee vs Dragunov | 13–12 | 52.00% |
| Kay Mahgee vs King | 7–17 | 29.17% |
| Kay Mahgee vs Hwoarang | 11–10 | 52.38% |
| Kay Mahgee vs Kazuya | 5–14 | 26.32% |
| Kay Mahgee vs Reina | 8–11 | 42.11% |
| Kay Mahgee vs Clive | 7–11 | 38.89% |
| Kay Mahgee vs Law | 8–9 | 47.06% |
| Kay Mahgee vs Jun | 7–9 | 43.75% |
| Kay Mahgee vs Lili | 8–7 | 53.33% |
| Kay Mahgee vs Nina | 9–5 | 64.29% |
| Kay Mahgee vs Asuka | 5–7 | 41.67% |
| Kay Mahgee vs Lars | 6–5 | 54.55% |
| Kay Mahgee vs Victor | 4–7 | 36.36% |
| Kay Mahgee vs Heihachi | 1–9 | 10.00% |
| Kay Mahgee vs Paul | 4–5 | 44.44% |
| Kay Mahgee vs Azucena | 3–6 | 33.33% |
| Kay Mahgee vs Feng | 3–5 | 37.50% |
| Kay Mahgee vs Yoshimitsu | 2–5 | 28.57% |
| Kay Mahgee vs Bryan | 3–4 | 42.86% |
| Kay Mahgee vs Leo | 2–5 | 28.57% |
| Kay Mahgee vs Lee | 2–5 | 28.57% |
| Kay Mahgee vs Leroy | 1–6 | 14.29% |
| Kay Mahgee vs Xiaoyu | 0–6 | 0.00% |
| Kay Mahgee vs Alisa | 2–3 | 40.00% |
| Kay Mahgee vs Eddy | 0–5 | 0.00% |
| Kay Mahgee vs Anna | 2–3 | 40.00% |
| Kay Mahgee vs Armor King | 4–1 | 80.00% |
| Kay Mahgee vs Zafina | 1–3 | 25.00% |
| Kay Mahgee vs Claudio | 2–1 | 66.67% |
| Kay Mahgee vs Kuma | 0–3 | 0.00% |
| Kay Mahgee vs Devil Jin | 1–1 | 50.00% |
| Kay Mahgee vs Raven | 0–2 | 0.00% |
| Kay Mahgee vs Jack-8 | 1–0 | 100.00% |
| Kay Mahgee vs Lidia | 1–0 | 100.00% |
| Kay Mahgee vs Miary Zo | 1–0 | 100.00% |
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.