1. Most importantly he has the logical faculties of what every human being should have but doesn't. He most likely has Asperger's.
2. Devotes A LOT of time to watching and studying tennis. This combined with logical intuition will inevitably lead to seeing patterns and the development of a system to judge gambling lines.
3. Has discipline. Look at the way he keeps his thread tidy. You need this to bank roll properly and to only bet when is applicable.
4. Searches for value in betting lines that are "off" and then shopping for the best price or vice versa. This is impossible if your system for judging matches is off obviously. Like I said logic+knowledge=system. When a system is right you can allocate different percentage wagers instead of flat betting, which is actually when one should even begin gambling.
If you aren't betting lines that are the most "off" you are an IDIOT.
Anyway this is all very obvious and if you're a decent human being you would have seen this.