| John Mahalo vs Bryan | 143–102 | 58.37% |
| John Mahalo vs King | 96–138 | 41.03% |
| John Mahalo vs Kazuya | 126–96 | 56.76% |
| John Mahalo vs Jin | 93–91 | 50.54% |
| John Mahalo vs Dragunov | 80–82 | 49.38% |
| John Mahalo vs Hwoarang | 62–96 | 39.24% |
| John Mahalo vs Steve | 85–73 | 53.80% |
| John Mahalo vs Reina | 92–65 | 58.60% |
| John Mahalo vs Yoshimitsu | 70–76 | 47.95% |
| John Mahalo vs Paul | 66–70 | 48.53% |
| John Mahalo vs Law | 55–55 | 50.00% |
| John Mahalo vs Lili | 42–67 | 38.53% |
| John Mahalo vs Azucena | 40–54 | 42.55% |
| John Mahalo vs Xiaoyu | 45–47 | 48.91% |
| John Mahalo vs Jun | 43–49 | 46.74% |
| John Mahalo vs Lee | 42–41 | 50.60% |
| John Mahalo vs Lars | 41–36 | 53.25% |
| John Mahalo vs Feng | 32–44 | 42.11% |
| John Mahalo vs Heihachi | 26–48 | 35.14% |
| John Mahalo vs Alisa | 25–47 | 34.72% |
| John Mahalo vs Eddy | 38–34 | 52.78% |
| John Mahalo vs Asuka | 33–38 | 46.48% |
| John Mahalo vs Devil Jin | 40–30 | 57.14% |
| John Mahalo vs Lidia | 44–26 | 62.86% |
| John Mahalo vs Fahkumram | 30–31 | 49.18% |
| John Mahalo vs Victor | 28–32 | 46.67% |
| John Mahalo vs Jack-8 | 21–37 | 36.21% |
| John Mahalo vs Leo | 32–25–1 | 56.14% |
| John Mahalo vs Raven | 30–27 | 52.63% |
| John Mahalo vs Clive | 20–35 | 36.36% |
| John Mahalo vs Kuma | 16–37 | 30.19% |
| John Mahalo vs Claudio | 29–23 | 55.77% |
| John Mahalo vs Nina | 15–34 | 30.61% |
| John Mahalo vs Leroy | 20–24 | 45.45% |
| John Mahalo vs Zafina | 15–22 | 40.54% |
| John Mahalo vs Anna | 16–21 | 43.24% |
| John Mahalo vs Armor King | 9–9 | 50.00% |
| John Mahalo vs Shaheen | 9–8 | 52.94% |
| John Mahalo vs Panda | 8–8 | 50.00% |
| John Mahalo vs Miary Zo | 2–1 | 66.67% |
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.