Do you search for medical information about the players? Do you have any inside information about medical situation of injury players and other stuff like that?
Yes we would subscribe to certain outlets that would on occasion give us first notice of particular injuries of certain players prior to the off specifically for likes of Tennis, of course this can all be mostly deciphered on that players particular twitter for example.
As a side note from a risk management perspective, upon profiling certain customers we would certainly research the person & access information on them that which is accessible via the public web, for example your facebook, your Linkedin, if you have a public criminal record, your education etc. This would be extensive though in cases of high profile bettors. Fraud investigations teams also have the ability to see what you have open within other tabs of your browser, (Research: Browser Fingerprinting) for example, if you create an account under the name of John Doe but you have facebook account open with the name Sam Smith, this will aid in their investigation, these methods are only implied when an account has flagged as fraud and is already under investigation. Of course this will never be made public to you other than they will email to inform you after review they are suspending /closing your account which is their due right as per their T&Cs